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linux/fs/xfs/linux-2.6/xfs_ioctl.c
Jan Blunck 1d957f9bf8 Introduce path_put() 
* Add path_put() functions for releasing a reference to the dentry and
  vfsmount of a struct path in the right order

* Switch from path_release(nd) to path_put(&nd->path)

* Rename dput_path() to path_put_conditional()

[akpm@linux-foundation.org: fix cifs]
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: <linux-fsdevel@vger.kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Steven French <sfrench@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-14 21:13:33 -08:00

1335 lines
28 KiB
C
Raw Blame History

/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_rtalloc.h"
#include "xfs_itable.h"
#include "xfs_error.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_bmap.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_dfrag.h"
#include "xfs_fsops.h"
#include "xfs_vnodeops.h"
#include <linux/capability.h>
#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/pagemap.h>
/*
* xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
* a file or fs handle.
*
* XFS_IOC_PATH_TO_FSHANDLE
* returns fs handle for a mount point or path within that mount point
* XFS_IOC_FD_TO_HANDLE
* returns full handle for a FD opened in user space
* XFS_IOC_PATH_TO_HANDLE
* returns full handle for a path
*/
STATIC int
xfs_find_handle(
unsigned int cmd,
void __user *arg)
{
int hsize;
xfs_handle_t handle;
xfs_fsop_handlereq_t hreq;
struct inode *inode;
if (copy_from_user(&hreq, arg, sizeof(hreq)))
return -XFS_ERROR(EFAULT);
memset((char *)&handle, 0, sizeof(handle));
switch (cmd) {
case XFS_IOC_PATH_TO_FSHANDLE:
case XFS_IOC_PATH_TO_HANDLE: {
struct nameidata nd;
int error;
error = user_path_walk_link((const char __user *)hreq.path, &nd);
if (error)
return error;
ASSERT(nd.path.dentry);
ASSERT(nd.path.dentry->d_inode);
inode = igrab(nd.path.dentry->d_inode);
path_put(&nd.path);
break;
}
case XFS_IOC_FD_TO_HANDLE: {
struct file *file;
file = fget(hreq.fd);
if (!file)
return -EBADF;
ASSERT(file->f_path.dentry);
ASSERT(file->f_path.dentry->d_inode);
inode = igrab(file->f_path.dentry->d_inode);
fput(file);
break;
}
default:
ASSERT(0);
return -XFS_ERROR(EINVAL);
}
if (inode->i_sb->s_magic != XFS_SB_MAGIC) {
/* we're not in XFS anymore, Toto */
iput(inode);
return -XFS_ERROR(EINVAL);
}
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
case S_IFDIR:
case S_IFLNK:
break;
default:
iput(inode);
return -XFS_ERROR(EBADF);
}
/* now we can grab the fsid */
memcpy(&handle.ha_fsid, XFS_I(inode)->i_mount->m_fixedfsid,
sizeof(xfs_fsid_t));
hsize = sizeof(xfs_fsid_t);
if (cmd != XFS_IOC_PATH_TO_FSHANDLE) {
xfs_inode_t *ip = XFS_I(inode);
int lock_mode;
/* need to get access to the xfs_inode to read the generation */
lock_mode = xfs_ilock_map_shared(ip);
/* fill in fid section of handle from inode */
handle.ha_fid.fid_len = sizeof(xfs_fid_t) -
sizeof(handle.ha_fid.fid_len);
handle.ha_fid.fid_pad = 0;
handle.ha_fid.fid_gen = ip->i_d.di_gen;
handle.ha_fid.fid_ino = ip->i_ino;
xfs_iunlock_map_shared(ip, lock_mode);
hsize = XFS_HSIZE(handle);
}
/* now copy our handle into the user buffer & write out the size */
if (copy_to_user(hreq.ohandle, &handle, hsize) ||
copy_to_user(hreq.ohandlen, &hsize, sizeof(__s32))) {
iput(inode);
return -XFS_ERROR(EFAULT);
}
iput(inode);
return 0;
}
/*
* Convert userspace handle data into inode.
*
* We use the fact that all the fsop_handlereq ioctl calls have a data
* structure argument whose first component is always a xfs_fsop_handlereq_t,
* so we can pass that sub structure into this handy, shared routine.
*
* If no error, caller must always iput the returned inode.
*/
STATIC int
xfs_vget_fsop_handlereq(
xfs_mount_t *mp,
struct inode *parinode, /* parent inode pointer */
xfs_fsop_handlereq_t *hreq,
struct inode **inode)
{
void __user *hanp;
size_t hlen;
xfs_fid_t *xfid;
xfs_handle_t *handlep;
xfs_handle_t handle;
xfs_inode_t *ip;
xfs_ino_t ino;
__u32 igen;
int error;
/*
* Only allow handle opens under a directory.
*/
if (!S_ISDIR(parinode->i_mode))
return XFS_ERROR(ENOTDIR);
hanp = hreq->ihandle;
hlen = hreq->ihandlen;
handlep = &handle;
if (hlen < sizeof(handlep->ha_fsid) || hlen > sizeof(*handlep))
return XFS_ERROR(EINVAL);
if (copy_from_user(handlep, hanp, hlen))
return XFS_ERROR(EFAULT);
if (hlen < sizeof(*handlep))
memset(((char *)handlep) + hlen, 0, sizeof(*handlep) - hlen);
if (hlen > sizeof(handlep->ha_fsid)) {
if (handlep->ha_fid.fid_len !=
(hlen - sizeof(handlep->ha_fsid) -
sizeof(handlep->ha_fid.fid_len)) ||
handlep->ha_fid.fid_pad)
return XFS_ERROR(EINVAL);
}
/*
* Crack the handle, obtain the inode # & generation #
*/
xfid = (struct xfs_fid *)&handlep->ha_fid;
if (xfid->fid_len == sizeof(*xfid) - sizeof(xfid->fid_len)) {
ino = xfid->fid_ino;
igen = xfid->fid_gen;
} else {
return XFS_ERROR(EINVAL);
}
/*
* Get the XFS inode, building a Linux inode to go with it.
*/
error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
if (error)
return error;
if (ip == NULL)
return XFS_ERROR(EIO);
if (ip->i_d.di_mode == 0 || ip->i_d.di_gen != igen) {
xfs_iput_new(ip, XFS_ILOCK_SHARED);
return XFS_ERROR(ENOENT);
}
xfs_iunlock(ip, XFS_ILOCK_SHARED);
*inode = XFS_ITOV(ip);
return 0;
}
STATIC int
xfs_open_by_handle(
xfs_mount_t *mp,
void __user *arg,
struct file *parfilp,
struct inode *parinode)
{
int error;
int new_fd;
int permflag;
struct file *filp;
struct inode *inode;
struct dentry *dentry;
xfs_fsop_handlereq_t hreq;
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -XFS_ERROR(EFAULT);
error = xfs_vget_fsop_handlereq(mp, parinode, &hreq, &inode);
if (error)
return -error;
/* Restrict xfs_open_by_handle to directories & regular files. */
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
iput(inode);
return -XFS_ERROR(EINVAL);
}
#if BITS_PER_LONG != 32
hreq.oflags |= O_LARGEFILE;
#endif
/* Put open permission in namei format. */
permflag = hreq.oflags;
if ((permflag+1) & O_ACCMODE)
permflag++;
if (permflag & O_TRUNC)
permflag |= 2;
if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
(permflag & FMODE_WRITE) && IS_APPEND(inode)) {
iput(inode);
return -XFS_ERROR(EPERM);
}
if ((permflag & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
iput(inode);
return -XFS_ERROR(EACCES);
}
/* Can't write directories. */
if ( S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
iput(inode);
return -XFS_ERROR(EISDIR);
}
if ((new_fd = get_unused_fd()) < 0) {
iput(inode);
return new_fd;
}
dentry = d_alloc_anon(inode);
if (dentry == NULL) {
iput(inode);
put_unused_fd(new_fd);
return -XFS_ERROR(ENOMEM);
}
/* Ensure umount returns EBUSY on umounts while this file is open. */
mntget(parfilp->f_path.mnt);
/* Create file pointer. */
filp = dentry_open(dentry, parfilp->f_path.mnt, hreq.oflags);
if (IS_ERR(filp)) {
put_unused_fd(new_fd);
return -XFS_ERROR(-PTR_ERR(filp));
}
if (inode->i_mode & S_IFREG) {
/* invisible operation should not change atime */
filp->f_flags |= O_NOATIME;
filp->f_op = &xfs_invis_file_operations;
}
fd_install(new_fd, filp);
return new_fd;
}
/*
* This is a copy from fs/namei.c:vfs_readlink(), except for removing it's
* unused first argument.
*/
STATIC int
do_readlink(
char __user *buffer,
int buflen,
const char *link)
{
int len;
len = PTR_ERR(link);
if (IS_ERR(link))
goto out;
len = strlen(link);
if (len > (unsigned) buflen)
len = buflen;
if (copy_to_user(buffer, link, len))
len = -EFAULT;
out:
return len;
}
STATIC int
xfs_readlink_by_handle(
xfs_mount_t *mp,
void __user *arg,
struct inode *parinode)
{
struct inode *inode;
xfs_fsop_handlereq_t hreq;
__u32 olen;
void *link;
int error;
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -XFS_ERROR(EFAULT);
error = xfs_vget_fsop_handlereq(mp, parinode, &hreq, &inode);
if (error)
return -error;
/* Restrict this handle operation to symlinks only. */
if (!S_ISLNK(inode->i_mode)) {
error = -XFS_ERROR(EINVAL);
goto out_iput;
}
if (copy_from_user(&olen, hreq.ohandlen, sizeof(__u32))) {
error = -XFS_ERROR(EFAULT);
goto out_iput;
}
link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
if (!link)
goto out_iput;
error = -xfs_readlink(XFS_I(inode), link);
if (error)
goto out_kfree;
error = do_readlink(hreq.ohandle, olen, link);
if (error)
goto out_kfree;
out_kfree:
kfree(link);
out_iput:
iput(inode);
return error;
}
STATIC int
xfs_fssetdm_by_handle(
xfs_mount_t *mp,
void __user *arg,
struct inode *parinode)
{
int error;
struct fsdmidata fsd;
xfs_fsop_setdm_handlereq_t dmhreq;
struct inode *inode;
if (!capable(CAP_MKNOD))
return -XFS_ERROR(EPERM);
if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
return -XFS_ERROR(EFAULT);
error = xfs_vget_fsop_handlereq(mp, parinode, &dmhreq.hreq, &inode);
if (error)
return -error;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
error = -XFS_ERROR(EPERM);
goto out;
}
if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
error = -XFS_ERROR(EFAULT);
goto out;
}
error = -xfs_set_dmattrs(XFS_I(inode), fsd.fsd_dmevmask,
fsd.fsd_dmstate);
out:
iput(inode);
return error;
}
STATIC int
xfs_attrlist_by_handle(
xfs_mount_t *mp,
void __user *arg,
struct inode *parinode)
{
int error;
attrlist_cursor_kern_t *cursor;
xfs_fsop_attrlist_handlereq_t al_hreq;
struct inode *inode;
char *kbuf;
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
return -XFS_ERROR(EFAULT);
if (al_hreq.buflen > XATTR_LIST_MAX)
return -XFS_ERROR(EINVAL);
error = xfs_vget_fsop_handlereq(mp, parinode, &al_hreq.hreq, &inode);
if (error)
goto out;
kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
if (!kbuf)
goto out_vn_rele;
cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
error = xfs_attr_list(XFS_I(inode), kbuf, al_hreq.buflen,
al_hreq.flags, cursor);
if (error)
goto out_kfree;
if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
error = -EFAULT;
out_kfree:
kfree(kbuf);
out_vn_rele:
iput(inode);
out:
return -error;
}
STATIC int
xfs_attrmulti_attr_get(
struct inode *inode,
char *name,
char __user *ubuf,
__uint32_t *len,
__uint32_t flags)
{
char *kbuf;
int error = EFAULT;
if (*len > XATTR_SIZE_MAX)
return EINVAL;
kbuf = kmalloc(*len, GFP_KERNEL);
if (!kbuf)
return ENOMEM;
error = xfs_attr_get(XFS_I(inode), name, kbuf, (int *)len, flags, NULL);
if (error)
goto out_kfree;
if (copy_to_user(ubuf, kbuf, *len))
error = EFAULT;
out_kfree:
kfree(kbuf);
return error;
}
STATIC int
xfs_attrmulti_attr_set(
struct inode *inode,
char *name,
const char __user *ubuf,
__uint32_t len,
__uint32_t flags)
{
char *kbuf;
int error = EFAULT;
if (IS_RDONLY(inode))
return -EROFS;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return EPERM;
if (len > XATTR_SIZE_MAX)
return EINVAL;
kbuf = kmalloc(len, GFP_KERNEL);
if (!kbuf)
return ENOMEM;
if (copy_from_user(kbuf, ubuf, len))
goto out_kfree;
error = xfs_attr_set(XFS_I(inode), name, kbuf, len, flags);
out_kfree:
kfree(kbuf);
return error;
}
STATIC int
xfs_attrmulti_attr_remove(
struct inode *inode,
char *name,
__uint32_t flags)
{
if (IS_RDONLY(inode))
return -EROFS;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return EPERM;
return xfs_attr_remove(XFS_I(inode), name, flags);
}
STATIC int
xfs_attrmulti_by_handle(
xfs_mount_t *mp,
void __user *arg,
struct inode *parinode)
{
int error;
xfs_attr_multiop_t *ops;
xfs_fsop_attrmulti_handlereq_t am_hreq;
struct inode *inode;
unsigned int i, size;
char *attr_name;
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
return -XFS_ERROR(EFAULT);
error = xfs_vget_fsop_handlereq(mp, parinode, &am_hreq.hreq, &inode);
if (error)
goto out;
error = E2BIG;
size = am_hreq.opcount * sizeof(attr_multiop_t);
if (!size || size > 16 * PAGE_SIZE)
goto out_vn_rele;
error = ENOMEM;
ops = kmalloc(size, GFP_KERNEL);
if (!ops)
goto out_vn_rele;
error = EFAULT;
if (copy_from_user(ops, am_hreq.ops, size))
goto out_kfree_ops;
attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
if (!attr_name)
goto out_kfree_ops;
error = 0;
for (i = 0; i < am_hreq.opcount; i++) {
ops[i].am_error = strncpy_from_user(attr_name,
ops[i].am_attrname, MAXNAMELEN);
if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
error = -ERANGE;
if (ops[i].am_error < 0)
break;
switch (ops[i].am_opcode) {
case ATTR_OP_GET:
ops[i].am_error = xfs_attrmulti_attr_get(inode,
attr_name, ops[i].am_attrvalue,
&ops[i].am_length, ops[i].am_flags);
break;
case ATTR_OP_SET:
ops[i].am_error = xfs_attrmulti_attr_set(inode,
attr_name, ops[i].am_attrvalue,
ops[i].am_length, ops[i].am_flags);
break;
case ATTR_OP_REMOVE:
ops[i].am_error = xfs_attrmulti_attr_remove(inode,
attr_name, ops[i].am_flags);
break;
default:
ops[i].am_error = EINVAL;
}
}
if (copy_to_user(am_hreq.ops, ops, size))
error = XFS_ERROR(EFAULT);
kfree(attr_name);
out_kfree_ops:
kfree(ops);
out_vn_rele:
iput(inode);
out:
return -error;
}
/* prototypes for a few of the stack-hungry cases that have
* their own functions. Functions are defined after their use
* so gcc doesn't get fancy and inline them with -03 */
STATIC int
xfs_ioc_space(
struct xfs_inode *ip,
struct inode *inode,
struct file *filp,
int flags,
unsigned int cmd,
void __user *arg);
STATIC int
xfs_ioc_bulkstat(
xfs_mount_t *mp,
unsigned int cmd,
void __user *arg);
STATIC int
xfs_ioc_fsgeometry_v1(
xfs_mount_t *mp,
void __user *arg);
STATIC int
xfs_ioc_fsgeometry(
xfs_mount_t *mp,
void __user *arg);
STATIC int
xfs_ioc_xattr(
xfs_inode_t *ip,
struct file *filp,
unsigned int cmd,
void __user *arg);
STATIC int
xfs_ioc_fsgetxattr(
xfs_inode_t *ip,
int attr,
void __user *arg);
STATIC int
xfs_ioc_getbmap(
struct xfs_inode *ip,
int flags,
unsigned int cmd,
void __user *arg);
STATIC int
xfs_ioc_getbmapx(
struct xfs_inode *ip,
void __user *arg);
int
xfs_ioctl(
xfs_inode_t *ip,
struct file *filp,
int ioflags,
unsigned int cmd,
void __user *arg)
{
struct inode *inode = filp->f_path.dentry->d_inode;
xfs_mount_t *mp = ip->i_mount;
int error;
xfs_itrace_entry(XFS_I(inode));
switch (cmd) {
case XFS_IOC_ALLOCSP:
case XFS_IOC_FREESP:
case XFS_IOC_RESVSP:
case XFS_IOC_UNRESVSP:
case XFS_IOC_ALLOCSP64:
case XFS_IOC_FREESP64:
case XFS_IOC_RESVSP64:
case XFS_IOC_UNRESVSP64:
/*
* Only allow the sys admin to reserve space unless
* unwritten extents are enabled.
*/
if (!XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
return xfs_ioc_space(ip, inode, filp, ioflags, cmd, arg);
case XFS_IOC_DIOINFO: {
struct dioattr da;
xfs_buftarg_t *target =
XFS_IS_REALTIME_INODE(ip) ?
mp->m_rtdev_targp : mp->m_ddev_targp;
da.d_mem = da.d_miniosz = 1 << target->bt_sshift;
da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
if (copy_to_user(arg, &da, sizeof(da)))
return -XFS_ERROR(EFAULT);
return 0;
}
case XFS_IOC_FSBULKSTAT_SINGLE:
case XFS_IOC_FSBULKSTAT:
case XFS_IOC_FSINUMBERS:
return xfs_ioc_bulkstat(mp, cmd, arg);
case XFS_IOC_FSGEOMETRY_V1:
return xfs_ioc_fsgeometry_v1(mp, arg);
case XFS_IOC_FSGEOMETRY:
return xfs_ioc_fsgeometry(mp, arg);
case XFS_IOC_GETVERSION:
return put_user(inode->i_generation, (int __user *)arg);
case XFS_IOC_FSGETXATTR:
return xfs_ioc_fsgetxattr(ip, 0, arg);
case XFS_IOC_FSGETXATTRA:
return xfs_ioc_fsgetxattr(ip, 1, arg);
case XFS_IOC_GETXFLAGS:
case XFS_IOC_SETXFLAGS:
case XFS_IOC_FSSETXATTR:
return xfs_ioc_xattr(ip, filp, cmd, arg);
case XFS_IOC_FSSETDM: {
struct fsdmidata dmi;
if (copy_from_user(&dmi, arg, sizeof(dmi)))
return -XFS_ERROR(EFAULT);
error = xfs_set_dmattrs(ip, dmi.fsd_dmevmask,
dmi.fsd_dmstate);
return -error;
}
case XFS_IOC_GETBMAP:
case XFS_IOC_GETBMAPA:
return xfs_ioc_getbmap(ip, ioflags, cmd, arg);
case XFS_IOC_GETBMAPX:
return xfs_ioc_getbmapx(ip, arg);
case XFS_IOC_FD_TO_HANDLE:
case XFS_IOC_PATH_TO_HANDLE:
case XFS_IOC_PATH_TO_FSHANDLE:
return xfs_find_handle(cmd, arg);
case XFS_IOC_OPEN_BY_HANDLE:
return xfs_open_by_handle(mp, arg, filp, inode);
case XFS_IOC_FSSETDM_BY_HANDLE:
return xfs_fssetdm_by_handle(mp, arg, inode);
case XFS_IOC_READLINK_BY_HANDLE:
return xfs_readlink_by_handle(mp, arg, inode);
case XFS_IOC_ATTRLIST_BY_HANDLE:
return xfs_attrlist_by_handle(mp, arg, inode);
case XFS_IOC_ATTRMULTI_BY_HANDLE:
return xfs_attrmulti_by_handle(mp, arg, inode);
case XFS_IOC_SWAPEXT: {
error = xfs_swapext((struct xfs_swapext __user *)arg);
return -error;
}
case XFS_IOC_FSCOUNTS: {
xfs_fsop_counts_t out;
error = xfs_fs_counts(mp, &out);
if (error)
return -error;
if (copy_to_user(arg, &out, sizeof(out)))
return -XFS_ERROR(EFAULT);
return 0;
}
case XFS_IOC_SET_RESBLKS: {
xfs_fsop_resblks_t inout;
__uint64_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&inout, arg, sizeof(inout)))
return -XFS_ERROR(EFAULT);
/* input parameter is passed in resblks field of structure */
in = inout.resblks;
error = xfs_reserve_blocks(mp, &in, &inout);
if (error)
return -error;
if (copy_to_user(arg, &inout, sizeof(inout)))
return -XFS_ERROR(EFAULT);
return 0;
}
case XFS_IOC_GET_RESBLKS: {
xfs_fsop_resblks_t out;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
error = xfs_reserve_blocks(mp, NULL, &out);
if (error)
return -error;
if (copy_to_user(arg, &out, sizeof(out)))
return -XFS_ERROR(EFAULT);
return 0;
}
case XFS_IOC_FSGROWFSDATA: {
xfs_growfs_data_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&in, arg, sizeof(in)))
return -XFS_ERROR(EFAULT);
error = xfs_growfs_data(mp, &in);
return -error;
}
case XFS_IOC_FSGROWFSLOG: {
xfs_growfs_log_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&in, arg, sizeof(in)))
return -XFS_ERROR(EFAULT);
error = xfs_growfs_log(mp, &in);
return -error;
}
case XFS_IOC_FSGROWFSRT: {
xfs_growfs_rt_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&in, arg, sizeof(in)))
return -XFS_ERROR(EFAULT);
error = xfs_growfs_rt(mp, &in);
return -error;
}
case XFS_IOC_FREEZE:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (inode->i_sb->s_frozen == SB_UNFROZEN)
freeze_bdev(inode->i_sb->s_bdev);
return 0;
case XFS_IOC_THAW:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (inode->i_sb->s_frozen != SB_UNFROZEN)
thaw_bdev(inode->i_sb->s_bdev, inode->i_sb);
return 0;
case XFS_IOC_GOINGDOWN: {
__uint32_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (get_user(in, (__uint32_t __user *)arg))
return -XFS_ERROR(EFAULT);
error = xfs_fs_goingdown(mp, in);
return -error;
}
case XFS_IOC_ERROR_INJECTION: {
xfs_error_injection_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&in, arg, sizeof(in)))
return -XFS_ERROR(EFAULT);
error = xfs_errortag_add(in.errtag, mp);
return -error;
}
case XFS_IOC_ERROR_CLEARALL:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
error = xfs_errortag_clearall(mp, 1);
return -error;
default:
return -ENOTTY;
}
}
STATIC int
xfs_ioc_space(
struct xfs_inode *ip,
struct inode *inode,
struct file *filp,
int ioflags,
unsigned int cmd,
void __user *arg)
{
xfs_flock64_t bf;
int attr_flags = 0;
int error;
if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
return -XFS_ERROR(EPERM);
if (!(filp->f_mode & FMODE_WRITE))
return -XFS_ERROR(EBADF);
if (!S_ISREG(inode->i_mode))
return -XFS_ERROR(EINVAL);
if (copy_from_user(&bf, arg, sizeof(bf)))
return -XFS_ERROR(EFAULT);
if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
attr_flags |= ATTR_NONBLOCK;
if (ioflags & IO_INVIS)
attr_flags |= ATTR_DMI;
error = xfs_change_file_space(ip, cmd, &bf, filp->f_pos,
NULL, attr_flags);
return -error;
}
STATIC int
xfs_ioc_bulkstat(
xfs_mount_t *mp,
unsigned int cmd,
void __user *arg)
{
xfs_fsop_bulkreq_t bulkreq;
int count; /* # of records returned */
xfs_ino_t inlast; /* last inode number */
int done;
int error;
/* done = 1 if there are more stats to get and if bulkstat */
/* should be called again (unused here, but used in dmapi) */
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (XFS_FORCED_SHUTDOWN(mp))
return -XFS_ERROR(EIO);
if (copy_from_user(&bulkreq, arg, sizeof(xfs_fsop_bulkreq_t)))
return -XFS_ERROR(EFAULT);
if (copy_from_user(&inlast, bulkreq.lastip, sizeof(__s64)))
return -XFS_ERROR(EFAULT);
if ((count = bulkreq.icount) <= 0)
return -XFS_ERROR(EINVAL);
if (bulkreq.ubuffer == NULL)
return -XFS_ERROR(EINVAL);
if (cmd == XFS_IOC_FSINUMBERS)
error = xfs_inumbers(mp, &inlast, &count,
bulkreq.ubuffer, xfs_inumbers_fmt);
else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE)
error = xfs_bulkstat_single(mp, &inlast,
bulkreq.ubuffer, &done);
else /* XFS_IOC_FSBULKSTAT */
error = xfs_bulkstat(mp, &inlast, &count,
(bulkstat_one_pf)xfs_bulkstat_one, NULL,
sizeof(xfs_bstat_t), bulkreq.ubuffer,
BULKSTAT_FG_QUICK, &done);
if (error)
return -error;
if (bulkreq.ocount != NULL) {
if (copy_to_user(bulkreq.lastip, &inlast,
sizeof(xfs_ino_t)))
return -XFS_ERROR(EFAULT);
if (copy_to_user(bulkreq.ocount, &count, sizeof(count)))
return -XFS_ERROR(EFAULT);
}
return 0;
}
STATIC int
xfs_ioc_fsgeometry_v1(
xfs_mount_t *mp,
void __user *arg)
{
xfs_fsop_geom_v1_t fsgeo;
int error;
error = xfs_fs_geometry(mp, (xfs_fsop_geom_t *)&fsgeo, 3);
if (error)
return -error;
if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
return -XFS_ERROR(EFAULT);
return 0;
}
STATIC int
xfs_ioc_fsgeometry(
xfs_mount_t *mp,
void __user *arg)
{
xfs_fsop_geom_t fsgeo;
int error;
error = xfs_fs_geometry(mp, &fsgeo, 4);
if (error)
return -error;
if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
return -XFS_ERROR(EFAULT);
return 0;
}
/*
* Linux extended inode flags interface.
*/
STATIC unsigned int
xfs_merge_ioc_xflags(
unsigned int flags,
unsigned int start)
{
unsigned int xflags = start;
if (flags & FS_IMMUTABLE_FL)
xflags |= XFS_XFLAG_IMMUTABLE;
else
xflags &= ~XFS_XFLAG_IMMUTABLE;
if (flags & FS_APPEND_FL)
xflags |= XFS_XFLAG_APPEND;
else
xflags &= ~XFS_XFLAG_APPEND;
if (flags & FS_SYNC_FL)
xflags |= XFS_XFLAG_SYNC;
else
xflags &= ~XFS_XFLAG_SYNC;
if (flags & FS_NOATIME_FL)
xflags |= XFS_XFLAG_NOATIME;
else
xflags &= ~XFS_XFLAG_NOATIME;
if (flags & FS_NODUMP_FL)
xflags |= XFS_XFLAG_NODUMP;
else
xflags &= ~XFS_XFLAG_NODUMP;
return xflags;
}
STATIC unsigned int
xfs_di2lxflags(
__uint16_t di_flags)
{
unsigned int flags = 0;
if (di_flags & XFS_DIFLAG_IMMUTABLE)
flags |= FS_IMMUTABLE_FL;
if (di_flags & XFS_DIFLAG_APPEND)
flags |= FS_APPEND_FL;
if (di_flags & XFS_DIFLAG_SYNC)
flags |= FS_SYNC_FL;
if (di_flags & XFS_DIFLAG_NOATIME)
flags |= FS_NOATIME_FL;
if (di_flags & XFS_DIFLAG_NODUMP)
flags |= FS_NODUMP_FL;
return flags;
}
STATIC int
xfs_ioc_fsgetxattr(
xfs_inode_t *ip,
int attr,
void __user *arg)
{
struct fsxattr fa;
xfs_ilock(ip, XFS_ILOCK_SHARED);
fa.fsx_xflags = xfs_ip2xflags(ip);
fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
fa.fsx_projid = ip->i_d.di_projid;
if (attr) {
if (ip->i_afp) {
if (ip->i_afp->if_flags & XFS_IFEXTENTS)
fa.fsx_nextents = ip->i_afp->if_bytes /
sizeof(xfs_bmbt_rec_t);
else
fa.fsx_nextents = ip->i_d.di_anextents;
} else
fa.fsx_nextents = 0;
} else {
if (ip->i_df.if_flags & XFS_IFEXTENTS)
fa.fsx_nextents = ip->i_df.if_bytes /
sizeof(xfs_bmbt_rec_t);
else
fa.fsx_nextents = ip->i_d.di_nextents;
}
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (copy_to_user(arg, &fa, sizeof(fa)))
return -EFAULT;
return 0;
}
STATIC int
xfs_ioc_xattr(
xfs_inode_t *ip,
struct file *filp,
unsigned int cmd,
void __user *arg)
{
struct fsxattr fa;
struct bhv_vattr *vattr;
int error = 0;
int attr_flags;
unsigned int flags;
vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
if (unlikely(!vattr))
return -ENOMEM;
switch (cmd) {
case XFS_IOC_FSSETXATTR: {
if (copy_from_user(&fa, arg, sizeof(fa))) {
error = -EFAULT;
break;
}
attr_flags = 0;
if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
attr_flags |= ATTR_NONBLOCK;
vattr->va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE | XFS_AT_PROJID;
vattr->va_xflags = fa.fsx_xflags;
vattr->va_extsize = fa.fsx_extsize;
vattr->va_projid = fa.fsx_projid;
error = xfs_setattr(ip, vattr, attr_flags, NULL);
if (likely(!error))
vn_revalidate(XFS_ITOV(ip)); /* update flags */
error = -error;
break;
}
case XFS_IOC_GETXFLAGS: {
flags = xfs_di2lxflags(ip->i_d.di_flags);
if (copy_to_user(arg, &flags, sizeof(flags)))
error = -EFAULT;
break;
}
case XFS_IOC_SETXFLAGS: {
if (copy_from_user(&flags, arg, sizeof(flags))) {
error = -EFAULT;
break;
}
if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
FS_NOATIME_FL | FS_NODUMP_FL | \
FS_SYNC_FL)) {
error = -EOPNOTSUPP;
break;
}
attr_flags = 0;
if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
attr_flags |= ATTR_NONBLOCK;
vattr->va_mask = XFS_AT_XFLAGS;
vattr->va_xflags = xfs_merge_ioc_xflags(flags,
xfs_ip2xflags(ip));
error = xfs_setattr(ip, vattr, attr_flags, NULL);
if (likely(!error))
vn_revalidate(XFS_ITOV(ip)); /* update flags */
error = -error;
break;
}
default:
error = -ENOTTY;
break;
}
kfree(vattr);
return error;
}
STATIC int
xfs_ioc_getbmap(
struct xfs_inode *ip,
int ioflags,
unsigned int cmd,
void __user *arg)
{
struct getbmap bm;
int iflags;
int error;
if (copy_from_user(&bm, arg, sizeof(bm)))
return -XFS_ERROR(EFAULT);
if (bm.bmv_count < 2)
return -XFS_ERROR(EINVAL);
iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
if (ioflags & IO_INVIS)
iflags |= BMV_IF_NO_DMAPI_READ;
error = xfs_getbmap(ip, &bm, (struct getbmap __user *)arg+1, iflags);
if (error)
return -error;
if (copy_to_user(arg, &bm, sizeof(bm)))
return -XFS_ERROR(EFAULT);
return 0;
}
STATIC int
xfs_ioc_getbmapx(
struct xfs_inode *ip,
void __user *arg)
{
struct getbmapx bmx;
struct getbmap bm;
int iflags;
int error;
if (copy_from_user(&bmx, arg, sizeof(bmx)))
return -XFS_ERROR(EFAULT);
if (bmx.bmv_count < 2)
return -XFS_ERROR(EINVAL);
/*
* Map input getbmapx structure to a getbmap
* structure for xfs_getbmap.
*/
GETBMAP_CONVERT(bmx, bm);
iflags = bmx.bmv_iflags;
if (iflags & (~BMV_IF_VALID))
return -XFS_ERROR(EINVAL);
iflags |= BMV_IF_EXTENDED;
error = xfs_getbmap(ip, &bm, (struct getbmapx __user *)arg+1, iflags);
if (error)
return -error;
GETBMAP_CONVERT(bm, bmx);
if (copy_to_user(arg, &bmx, sizeof(bmx)))
return -XFS_ERROR(EFAULT);
return 0;
}
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