#include "xfs_vnodeops.h"
#include "xfs_quota.h"
#include "xfs_inode_item.h"
+#include "xfs_export.h"
#include <linux/capability.h>
#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/pagemap.h>
+#include <linux/exportfs.h>
/*
* xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
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.
+ * No need to do permission checks on the various pathname components
+ * as the handle operations are privileged.
*/
STATIC int
-xfs_vget_fsop_handlereq(
- xfs_mount_t *mp,
- struct inode *parinode, /* parent inode pointer */
- xfs_fsop_handlereq_t *hreq,
- struct inode **inode)
+xfs_handle_acceptable(
+ void *context,
+ struct dentry *dentry)
+{
+ return 1;
+}
+
+/*
+ * Convert userspace handle data into a dentry.
+ */
+struct dentry *
+xfs_handle_to_dentry(
+ struct file *parfilp,
+ void __user *uhandle,
+ u32 hlen)
{
- 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;
+ struct xfs_fid64 fid;
/*
* 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_gen != igen) {
- xfs_iput_new(ip, XFS_ILOCK_SHARED);
- return XFS_ERROR(ENOENT);
- }
-
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
+ if (!S_ISDIR(parfilp->f_path.dentry->d_inode->i_mode))
+ return ERR_PTR(-ENOTDIR);
+
+ if (hlen != sizeof(xfs_handle_t))
+ return ERR_PTR(-EINVAL);
+ if (copy_from_user(&handle, uhandle, hlen))
+ return ERR_PTR(-EFAULT);
+ if (handle.ha_fid.fid_len !=
+ sizeof(handle.ha_fid) - sizeof(handle.ha_fid.fid_len))
+ return ERR_PTR(-EINVAL);
+
+ memset(&fid, 0, sizeof(struct fid));
+ fid.ino = handle.ha_fid.fid_ino;
+ fid.gen = handle.ha_fid.fid_gen;
+
+ return exportfs_decode_fh(parfilp->f_path.mnt, (struct fid *)&fid, 3,
+ FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG,
+ xfs_handle_acceptable, NULL);
+}
- *inode = VFS_I(ip);
- return 0;
+STATIC struct dentry *
+xfs_handlereq_to_dentry(
+ struct file *parfilp,
+ xfs_fsop_handlereq_t *hreq)
+{
+ return xfs_handle_to_dentry(parfilp, hreq->ihandle, hreq->ihandlen);
}
int
xfs_open_by_handle(
- xfs_mount_t *mp,
- xfs_fsop_handlereq_t *hreq,
struct file *parfilp,
- struct inode *parinode)
+ xfs_fsop_handlereq_t *hreq)
{
const struct cred *cred = current_cred();
int error;
- int new_fd;
+ int fd;
int permflag;
struct file *filp;
struct inode *inode;
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
- error = xfs_vget_fsop_handlereq(mp, parinode, hreq, &inode);
- if (error)
- return -error;
+ dentry = xfs_handlereq_to_dentry(parfilp, hreq);
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
+ inode = dentry->d_inode;
/* 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);
+ error = -XFS_ERROR(EPERM);
+ goto out_dput;
}
#if BITS_PER_LONG != 32
hreq->oflags |= O_LARGEFILE;
#endif
+
/* Put open permission in namei format. */
permflag = hreq->oflags;
if ((permflag+1) & O_ACCMODE)
if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
(permflag & FMODE_WRITE) && IS_APPEND(inode)) {
- iput(inode);
- return -XFS_ERROR(EPERM);
+ error = -XFS_ERROR(EPERM);
+ goto out_dput;
}
if ((permflag & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
- iput(inode);
- return -XFS_ERROR(EACCES);
+ error = -XFS_ERROR(EACCES);
+ goto out_dput;
}
/* Can't write directories. */
- if ( S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
- iput(inode);
- return -XFS_ERROR(EISDIR);
+ if (S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
+ error = -XFS_ERROR(EISDIR);
+ goto out_dput;
}
- if ((new_fd = get_unused_fd()) < 0) {
- iput(inode);
- return new_fd;
+ fd = get_unused_fd();
+ if (fd < 0) {
+ error = fd;
+ goto out_dput;
}
- dentry = d_obtain_alias(inode);
- if (IS_ERR(dentry)) {
- put_unused_fd(new_fd);
- return PTR_ERR(dentry);
- }
-
- /* 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, cred);
+ filp = dentry_open(dentry, mntget(parfilp->f_path.mnt),
+ hreq->oflags, cred);
if (IS_ERR(filp)) {
- put_unused_fd(new_fd);
- return -XFS_ERROR(-PTR_ERR(filp));
+ put_unused_fd(fd);
+ return PTR_ERR(filp);
}
if (inode->i_mode & S_IFREG) {
- /* invisible operation should not change atime */
filp->f_flags |= O_NOATIME;
filp->f_mode |= FMODE_NOCMTIME;
}
- fd_install(new_fd, filp);
- return new_fd;
+ fd_install(fd, filp);
+ return fd;
+
+ out_dput:
+ dput(dentry);
+ return error;
}
/*
int
xfs_readlink_by_handle(
- xfs_mount_t *mp,
- xfs_fsop_handlereq_t *hreq,
- struct inode *parinode)
+ struct file *parfilp,
+ xfs_fsop_handlereq_t *hreq)
{
- struct inode *inode;
+ struct dentry *dentry;
__u32 olen;
void *link;
int error;
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
- error = xfs_vget_fsop_handlereq(mp, parinode, hreq, &inode);
- if (error)
- return -error;
+ dentry = xfs_handlereq_to_dentry(parfilp, hreq);
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
/* Restrict this handle operation to symlinks only. */
- if (!S_ISLNK(inode->i_mode)) {
+ if (!S_ISLNK(dentry->d_inode->i_mode)) {
error = -XFS_ERROR(EINVAL);
- goto out_iput;
+ goto out_dput;
}
if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
error = -XFS_ERROR(EFAULT);
- goto out_iput;
+ goto out_dput;
}
link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
- if (!link)
- goto out_iput;
+ if (!link) {
+ error = -XFS_ERROR(ENOMEM);
+ goto out_dput;
+ }
- error = -xfs_readlink(XFS_I(inode), link);
+ error = -xfs_readlink(XFS_I(dentry->d_inode), link);
if (error)
goto out_kfree;
error = do_readlink(hreq->ohandle, olen, link);
out_kfree:
kfree(link);
- out_iput:
- iput(inode);
+ out_dput:
+ dput(dentry);
return error;
}
STATIC int
xfs_fssetdm_by_handle(
- xfs_mount_t *mp,
- void __user *arg,
- struct inode *parinode)
+ struct file *parfilp,
+ void __user *arg)
{
int error;
struct fsdmidata fsd;
xfs_fsop_setdm_handlereq_t dmhreq;
- struct inode *inode;
+ struct dentry *dentry;
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;
+ dentry = xfs_handlereq_to_dentry(parfilp, &dmhreq.hreq);
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
- if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
+ if (IS_IMMUTABLE(dentry->d_inode) || IS_APPEND(dentry->d_inode)) {
error = -XFS_ERROR(EPERM);
goto out;
}
goto out;
}
- error = -xfs_set_dmattrs(XFS_I(inode), fsd.fsd_dmevmask,
+ error = -xfs_set_dmattrs(XFS_I(dentry->d_inode), fsd.fsd_dmevmask,
fsd.fsd_dmstate);
out:
- iput(inode);
+ dput(dentry);
return error;
}
STATIC int
xfs_attrlist_by_handle(
- xfs_mount_t *mp,
- void __user *arg,
- struct inode *parinode)
+ struct file *parfilp,
+ void __user *arg)
{
- int error;
+ int error = -ENOMEM;
attrlist_cursor_kern_t *cursor;
xfs_fsop_attrlist_handlereq_t al_hreq;
- struct inode *inode;
+ struct dentry *dentry;
char *kbuf;
if (!capable(CAP_SYS_ADMIN))
if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
return -XFS_ERROR(EINVAL);
- error = xfs_vget_fsop_handlereq(mp, parinode, &al_hreq.hreq, &inode);
- if (error)
- goto out;
+ dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
if (!kbuf)
- goto out_vn_rele;
+ goto out_dput;
cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
- error = xfs_attr_list(XFS_I(inode), kbuf, al_hreq.buflen,
+ error = -xfs_attr_list(XFS_I(dentry->d_inode), kbuf, al_hreq.buflen,
al_hreq.flags, cursor);
if (error)
goto out_kfree;
out_kfree:
kfree(kbuf);
- out_vn_rele:
- iput(inode);
- out:
- return -error;
+ out_dput:
+ dput(dentry);
+ return error;
}
int
STATIC int
xfs_attrmulti_by_handle(
- xfs_mount_t *mp,
- void __user *arg,
struct file *parfilp,
- struct inode *parinode)
+ void __user *arg)
{
int error;
xfs_attr_multiop_t *ops;
xfs_fsop_attrmulti_handlereq_t am_hreq;
- struct inode *inode;
+ struct dentry *dentry;
unsigned int i, size;
char *attr_name;
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;
+ dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq);
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
error = E2BIG;
size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
if (!size || size > 16 * PAGE_SIZE)
- goto out_vn_rele;
+ goto out_dput;
error = ENOMEM;
ops = kmalloc(size, GFP_KERNEL);
if (!ops)
- goto out_vn_rele;
+ goto out_dput;
error = EFAULT;
if (copy_from_user(ops, am_hreq.ops, size))
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);
+ ops[i].am_error = xfs_attrmulti_attr_get(
+ dentry->d_inode, attr_name,
+ ops[i].am_attrvalue, &ops[i].am_length,
+ ops[i].am_flags);
break;
case ATTR_OP_SET:
ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
if (ops[i].am_error)
break;
- ops[i].am_error = xfs_attrmulti_attr_set(inode,
- attr_name, ops[i].am_attrvalue,
- ops[i].am_length, ops[i].am_flags);
+ ops[i].am_error = xfs_attrmulti_attr_set(
+ dentry->d_inode, attr_name,
+ ops[i].am_attrvalue, ops[i].am_length,
+ ops[i].am_flags);
mnt_drop_write(parfilp->f_path.mnt);
break;
case ATTR_OP_REMOVE:
ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
if (ops[i].am_error)
break;
- ops[i].am_error = xfs_attrmulti_attr_remove(inode,
- attr_name, ops[i].am_flags);
+ ops[i].am_error = xfs_attrmulti_attr_remove(
+ dentry->d_inode, attr_name,
+ ops[i].am_flags);
mnt_drop_write(parfilp->f_path.mnt);
break;
default:
kfree(attr_name);
out_kfree_ops:
kfree(ops);
- out_vn_rele:
- iput(inode);
- out:
+ out_dput:
+ dput(dentry);
return -error;
}
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -XFS_ERROR(EFAULT);
- return xfs_open_by_handle(mp, &hreq, filp, inode);
+ return xfs_open_by_handle(filp, &hreq);
}
case XFS_IOC_FSSETDM_BY_HANDLE:
- return xfs_fssetdm_by_handle(mp, arg, inode);
+ return xfs_fssetdm_by_handle(filp, arg);
case XFS_IOC_READLINK_BY_HANDLE: {
xfs_fsop_handlereq_t hreq;
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -XFS_ERROR(EFAULT);
- return xfs_readlink_by_handle(mp, &hreq, inode);
+ return xfs_readlink_by_handle(filp, &hreq);
}
case XFS_IOC_ATTRLIST_BY_HANDLE:
- return xfs_attrlist_by_handle(mp, arg, inode);
+ return xfs_attrlist_by_handle(filp, arg);
case XFS_IOC_ATTRMULTI_BY_HANDLE:
- return xfs_attrmulti_by_handle(mp, arg, filp, inode);
+ return xfs_attrmulti_by_handle(filp, arg);
case XFS_IOC_SWAPEXT: {
struct xfs_swapext sxp;
projects / linux-2.6-omap-h63xx.git / blobdiff