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xfs_ioctl.c
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xfs_ioctl.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_rtalloc.h"
#include "xfs_iwalk.h"
#include "xfs_itable.h"
#include "xfs_error.h"
#include "xfs_attr.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_fsops.h"
#include "xfs_discard.h"
#include "xfs_quota.h"
#include "xfs_export.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_trans.h"
#include "xfs_acl.h"
#include "xfs_btree.h"
#include <linux/fsmap.h>
#include "xfs_fsmap.h"
#include "scrub/xfs_scrub.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_health.h"
#include <linux/mount.h>
#include <linux/namei.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
*/
int
xfs_find_handle(
unsigned int cmd,
xfs_fsop_handlereq_t *hreq)
{
int hsize;
xfs_handle_t handle;
struct inode *inode;
struct fd f = {NULL};
struct path path;
int error;
struct xfs_inode *ip;
if (cmd == XFS_IOC_FD_TO_HANDLE) {
f = fdget(hreq->fd);
if (!f.file)
return -EBADF;
inode = file_inode(f.file);
} else {
error = user_path_at(AT_FDCWD, hreq->path, 0, &path);
if (error)
return error;
inode = d_inode(path.dentry);
}
ip = XFS_I(inode);
/*
* We can only generate handles for inodes residing on a XFS filesystem,
* and only for regular files, directories or symbolic links.
*/
error = -EINVAL;
if (inode->i_sb->s_magic != XFS_SB_MAGIC)
goto out_put;
error = -EBADF;
if (!S_ISREG(inode->i_mode) &&
!S_ISDIR(inode->i_mode) &&
!S_ISLNK(inode->i_mode))
goto out_put;
memcpy(&handle.ha_fsid, ip->i_mount->m_fixedfsid, sizeof(xfs_fsid_t));
if (cmd == XFS_IOC_PATH_TO_FSHANDLE) {
/*
* This handle only contains an fsid, zero the rest.
*/
memset(&handle.ha_fid, 0, sizeof(handle.ha_fid));
hsize = sizeof(xfs_fsid_t);
} else {
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 = inode->i_generation;
handle.ha_fid.fid_ino = ip->i_ino;
hsize = sizeof(xfs_handle_t);
}
error = -EFAULT;
if (copy_to_user(hreq->ohandle, &handle, hsize) ||
copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32)))
goto out_put;
error = 0;
out_put:
if (cmd == XFS_IOC_FD_TO_HANDLE)
fdput(f);
else
path_put(&path);
return error;
}
/*
* No need to do permission checks on the various pathname components
* as the handle operations are privileged.
*/
STATIC int
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)
{
xfs_handle_t handle;
struct xfs_fid64 fid;
/*
* Only allow handle opens under a directory.
*/
if (!S_ISDIR(file_inode(parfilp)->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);
}
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(
struct file *parfilp,
xfs_fsop_handlereq_t *hreq)
{
const struct cred *cred = current_cred();
int error;
int fd;
int permflag;
struct file *filp;
struct inode *inode;
struct dentry *dentry;
fmode_t fmode;
struct path path;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
dentry = xfs_handlereq_to_dentry(parfilp, hreq);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
inode = d_inode(dentry);
/* Restrict xfs_open_by_handle to directories & regular files. */
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
error = -EPERM;
goto out_dput;
}
#if BITS_PER_LONG != 32
hreq->oflags |= O_LARGEFILE;
#endif
permflag = hreq->oflags;
fmode = OPEN_FMODE(permflag);
if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
(fmode & FMODE_WRITE) && IS_APPEND(inode)) {
error = -EPERM;
goto out_dput;
}
if ((fmode & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
error = -EPERM;
goto out_dput;
}
/* Can't write directories. */
if (S_ISDIR(inode->i_mode) && (fmode & FMODE_WRITE)) {
error = -EISDIR;
goto out_dput;
}
fd = get_unused_fd_flags(0);
if (fd < 0) {
error = fd;
goto out_dput;
}
path.mnt = parfilp->f_path.mnt;
path.dentry = dentry;
filp = dentry_open(&path, hreq->oflags, cred);
dput(dentry);
if (IS_ERR(filp)) {
put_unused_fd(fd);
return PTR_ERR(filp);
}
if (S_ISREG(inode->i_mode)) {
filp->f_flags |= O_NOATIME;
filp->f_mode |= FMODE_NOCMTIME;
}
fd_install(fd, filp);
return fd;
out_dput:
dput(dentry);
return error;
}
int
xfs_readlink_by_handle(
struct file *parfilp,
xfs_fsop_handlereq_t *hreq)
{
struct dentry *dentry;
__u32 olen;
int error;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
dentry = xfs_handlereq_to_dentry(parfilp, hreq);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
/* Restrict this handle operation to symlinks only. */
if (!d_is_symlink(dentry)) {
error = -EINVAL;
goto out_dput;
}
if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
error = -EFAULT;
goto out_dput;
}
error = vfs_readlink(dentry, hreq->ohandle, olen);
out_dput:
dput(dentry);
return error;
}
int
xfs_set_dmattrs(
xfs_inode_t *ip,
uint evmask,
uint16_t state)
{
xfs_mount_t *mp = ip->i_mount;
xfs_trans_t *tp;
int error;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
ip->i_d.di_dmevmask = evmask;
ip->i_d.di_dmstate = state;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_trans_commit(tp);
return error;
}
STATIC int
xfs_fssetdm_by_handle(
struct file *parfilp,
void __user *arg)
{
int error;
struct fsdmidata fsd;
xfs_fsop_setdm_handlereq_t dmhreq;
struct dentry *dentry;
if (!capable(CAP_MKNOD))
return -EPERM;
if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
return -EFAULT;
error = mnt_want_write_file(parfilp);
if (error)
return error;
dentry = xfs_handlereq_to_dentry(parfilp, &dmhreq.hreq);
if (IS_ERR(dentry)) {
mnt_drop_write_file(parfilp);
return PTR_ERR(dentry);
}
if (IS_IMMUTABLE(d_inode(dentry)) || IS_APPEND(d_inode(dentry))) {
error = -EPERM;
goto out;
}
if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
error = -EFAULT;
goto out;
}
error = xfs_set_dmattrs(XFS_I(d_inode(dentry)), fsd.fsd_dmevmask,
fsd.fsd_dmstate);
out:
mnt_drop_write_file(parfilp);
dput(dentry);
return error;
}
STATIC int
xfs_attrlist_by_handle(
struct file *parfilp,
void __user *arg)
{
int error = -ENOMEM;
attrlist_cursor_kern_t *cursor;
struct xfs_fsop_attrlist_handlereq __user *p = arg;
xfs_fsop_attrlist_handlereq_t al_hreq;
struct dentry *dentry;
char *kbuf;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
return -EFAULT;
if (al_hreq.buflen < sizeof(struct attrlist) ||
al_hreq.buflen > XFS_XATTR_LIST_MAX)
return -EINVAL;
/*
* Reject flags, only allow namespaces.
*/
if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
return -EINVAL;
dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
kbuf = kmem_zalloc_large(al_hreq.buflen, 0);
if (!kbuf)
goto out_dput;
cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
error = xfs_attr_list(XFS_I(d_inode(dentry)), kbuf, al_hreq.buflen,
al_hreq.flags, cursor);
if (error)
goto out_kfree;
if (copy_to_user(&p->pos, cursor, sizeof(attrlist_cursor_kern_t))) {
error = -EFAULT;
goto out_kfree;
}
if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
error = -EFAULT;
out_kfree:
kmem_free(kbuf);
out_dput:
dput(dentry);
return error;
}
int
xfs_attrmulti_attr_get(
struct inode *inode,
unsigned char *name,
unsigned char __user *ubuf,
uint32_t *len,
uint32_t flags)
{
unsigned char *kbuf;
int error = -EFAULT;
if (*len > XFS_XATTR_SIZE_MAX)
return -EINVAL;
kbuf = kmem_zalloc_large(*len, 0);
if (!kbuf)
return -ENOMEM;
error = xfs_attr_get(XFS_I(inode), name, &kbuf, (int *)len, flags);
if (error)
goto out_kfree;
if (copy_to_user(ubuf, kbuf, *len))
error = -EFAULT;
out_kfree:
kmem_free(kbuf);
return error;
}
int
xfs_attrmulti_attr_set(
struct inode *inode,
unsigned char *name,
const unsigned char __user *ubuf,
uint32_t len,
uint32_t flags)
{
unsigned char *kbuf;
int error;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EPERM;
if (len > XFS_XATTR_SIZE_MAX)
return -EINVAL;
kbuf = memdup_user(ubuf, len);
if (IS_ERR(kbuf))
return PTR_ERR(kbuf);
error = xfs_attr_set(XFS_I(inode), name, kbuf, len, flags);
if (!error)
xfs_forget_acl(inode, name, flags);
kfree(kbuf);
return error;
}
int
xfs_attrmulti_attr_remove(
struct inode *inode,
unsigned char *name,
uint32_t flags)
{
int error;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EPERM;
error = xfs_attr_remove(XFS_I(inode), name, flags);
if (!error)
xfs_forget_acl(inode, name, flags);
return error;
}
STATIC int
xfs_attrmulti_by_handle(
struct file *parfilp,
void __user *arg)
{
int error;
xfs_attr_multiop_t *ops;
xfs_fsop_attrmulti_handlereq_t am_hreq;
struct dentry *dentry;
unsigned int i, size;
unsigned char *attr_name;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
return -EFAULT;
/* overflow check */
if (am_hreq.opcount >= INT_MAX / sizeof(xfs_attr_multiop_t))
return -E2BIG;
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_dput;
ops = memdup_user(am_hreq.ops, size);
if (IS_ERR(ops)) {
error = PTR_ERR(ops);
goto out_dput;
}
error = -ENOMEM;
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((char *)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(
d_inode(dentry), 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_file(parfilp);
if (ops[i].am_error)
break;
ops[i].am_error = xfs_attrmulti_attr_set(
d_inode(dentry), attr_name,
ops[i].am_attrvalue, ops[i].am_length,
ops[i].am_flags);
mnt_drop_write_file(parfilp);
break;
case ATTR_OP_REMOVE:
ops[i].am_error = mnt_want_write_file(parfilp);
if (ops[i].am_error)
break;
ops[i].am_error = xfs_attrmulti_attr_remove(
d_inode(dentry), attr_name,
ops[i].am_flags);
mnt_drop_write_file(parfilp);
break;
default:
ops[i].am_error = -EINVAL;
}
}
if (copy_to_user(am_hreq.ops, ops, size))
error = -EFAULT;
kfree(attr_name);
out_kfree_ops:
kfree(ops);
out_dput:
dput(dentry);
return error;
}
int
xfs_ioc_space(
struct file *filp,
unsigned int cmd,
xfs_flock64_t *bf)
{
struct inode *inode = file_inode(filp);
struct xfs_inode *ip = XFS_I(inode);
struct iattr iattr;
enum xfs_prealloc_flags flags = 0;
uint iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
int error;
if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
return -EPERM;
if (!(filp->f_mode & FMODE_WRITE))
return -EBADF;
if (!S_ISREG(inode->i_mode))
return -EINVAL;
if (filp->f_flags & O_DSYNC)
flags |= XFS_PREALLOC_SYNC;
if (filp->f_mode & FMODE_NOCMTIME)
flags |= XFS_PREALLOC_INVISIBLE;
error = mnt_want_write_file(filp);
if (error)
return error;
xfs_ilock(ip, iolock);
error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
if (error)
goto out_unlock;
switch (bf->l_whence) {
case 0: /*SEEK_SET*/
break;
case 1: /*SEEK_CUR*/
bf->l_start += filp->f_pos;
break;
case 2: /*SEEK_END*/
bf->l_start += XFS_ISIZE(ip);
break;
default:
error = -EINVAL;
goto out_unlock;
}
/*
* length of <= 0 for resv/unresv/zero is invalid. length for
* alloc/free is ignored completely and we have no idea what userspace
* might have set it to, so set it to zero to allow range
* checks to pass.
*/
switch (cmd) {
case XFS_IOC_ZERO_RANGE:
case XFS_IOC_RESVSP:
case XFS_IOC_RESVSP64:
case XFS_IOC_UNRESVSP:
case XFS_IOC_UNRESVSP64:
if (bf->l_len <= 0) {
error = -EINVAL;
goto out_unlock;
}
break;
default:
bf->l_len = 0;
break;
}
if (bf->l_start < 0 ||
bf->l_start > inode->i_sb->s_maxbytes ||
bf->l_start + bf->l_len < 0 ||
bf->l_start + bf->l_len >= inode->i_sb->s_maxbytes) {
error = -EINVAL;
goto out_unlock;
}
switch (cmd) {
case XFS_IOC_ZERO_RANGE:
flags |= XFS_PREALLOC_SET;
error = xfs_zero_file_space(ip, bf->l_start, bf->l_len);
break;
case XFS_IOC_RESVSP:
case XFS_IOC_RESVSP64:
flags |= XFS_PREALLOC_SET;
error = xfs_alloc_file_space(ip, bf->l_start, bf->l_len,
XFS_BMAPI_PREALLOC);
break;
case XFS_IOC_UNRESVSP:
case XFS_IOC_UNRESVSP64:
error = xfs_free_file_space(ip, bf->l_start, bf->l_len);
break;
case XFS_IOC_ALLOCSP:
case XFS_IOC_ALLOCSP64:
case XFS_IOC_FREESP:
case XFS_IOC_FREESP64:
flags |= XFS_PREALLOC_CLEAR;
if (bf->l_start > XFS_ISIZE(ip)) {
error = xfs_alloc_file_space(ip, XFS_ISIZE(ip),
bf->l_start - XFS_ISIZE(ip), 0);
if (error)
goto out_unlock;
}
iattr.ia_valid = ATTR_SIZE;
iattr.ia_size = bf->l_start;
error = xfs_vn_setattr_size(file_dentry(filp), &iattr);
break;
default:
ASSERT(0);
error = -EINVAL;
}
if (error)
goto out_unlock;
error = xfs_update_prealloc_flags(ip, flags);
out_unlock:
xfs_iunlock(ip, iolock);
mnt_drop_write_file(filp);
return error;
}
/* Return 0 on success or positive error */
int
xfs_fsbulkstat_one_fmt(
struct xfs_ibulk *breq,
const struct xfs_bulkstat *bstat)
{
struct xfs_bstat bs1;
xfs_bulkstat_to_bstat(breq->mp, &bs1, bstat);
if (copy_to_user(breq->ubuffer, &bs1, sizeof(bs1)))
return -EFAULT;
return xfs_ibulk_advance(breq, sizeof(struct xfs_bstat));
}
int
xfs_fsinumbers_fmt(
struct xfs_ibulk *breq,
const struct xfs_inumbers *igrp)
{
struct xfs_inogrp ig1;
xfs_inumbers_to_inogrp(&ig1, igrp);
if (copy_to_user(breq->ubuffer, &ig1, sizeof(struct xfs_inogrp)))
return -EFAULT;
return xfs_ibulk_advance(breq, sizeof(struct xfs_inogrp));
}
STATIC int
xfs_ioc_fsbulkstat(
xfs_mount_t *mp,
unsigned int cmd,
void __user *arg)
{
struct xfs_fsop_bulkreq bulkreq;
struct xfs_ibulk breq = {
.mp = mp,
.ocount = 0,
};
xfs_ino_t lastino;
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 -EIO;
if (copy_from_user(&bulkreq, arg, sizeof(struct xfs_fsop_bulkreq)))
return -EFAULT;
if (copy_from_user(&lastino, bulkreq.lastip, sizeof(__s64)))
return -EFAULT;
if (bulkreq.icount <= 0)
return -EINVAL;
if (bulkreq.ubuffer == NULL)
return -EINVAL;
breq.ubuffer = bulkreq.ubuffer;
breq.icount = bulkreq.icount;
/*
* FSBULKSTAT_SINGLE expects that *lastip contains the inode number
* that we want to stat. However, FSINUMBERS and FSBULKSTAT expect
* that *lastip contains either zero or the number of the last inode to
* be examined by the previous call and return results starting with
* the next inode after that. The new bulk request back end functions
* take the inode to start with, so we have to compute the startino
* parameter from lastino to maintain correct function. lastino == 0
* is a special case because it has traditionally meant "first inode
* in filesystem".
*/
if (cmd == XFS_IOC_FSINUMBERS) {
breq.startino = lastino ? lastino + 1 : 0;
error = xfs_inumbers(&breq, xfs_fsinumbers_fmt);
lastino = breq.startino - 1;
} else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE) {
breq.startino = lastino;
breq.icount = 1;
error = xfs_bulkstat_one(&breq, xfs_fsbulkstat_one_fmt);
} else { /* XFS_IOC_FSBULKSTAT */
breq.startino = lastino ? lastino + 1 : 0;
error = xfs_bulkstat(&breq, xfs_fsbulkstat_one_fmt);
lastino = breq.startino - 1;
}
if (error)
return error;
if (bulkreq.lastip != NULL &&
copy_to_user(bulkreq.lastip, &lastino, sizeof(xfs_ino_t)))
return -EFAULT;
if (bulkreq.ocount != NULL &&
copy_to_user(bulkreq.ocount, &breq.ocount, sizeof(__s32)))
return -EFAULT;
return 0;
}
/* Return 0 on success or positive error */
static int
xfs_bulkstat_fmt(
struct xfs_ibulk *breq,
const struct xfs_bulkstat *bstat)
{
if (copy_to_user(breq->ubuffer, bstat, sizeof(struct xfs_bulkstat)))
return -EFAULT;
return xfs_ibulk_advance(breq, sizeof(struct xfs_bulkstat));
}
/*
* Check the incoming bulk request @hdr from userspace and initialize the
* internal @breq bulk request appropriately. Returns 0 if the bulk request
* should proceed; -ECANCELED if there's nothing to do; or the usual
* negative error code.
*/
static int
xfs_bulk_ireq_setup(
struct xfs_mount *mp,
struct xfs_bulk_ireq *hdr,
struct xfs_ibulk *breq,
void __user *ubuffer)
{
if (hdr->icount == 0 ||
(hdr->flags & ~XFS_BULK_IREQ_FLAGS_ALL) ||
memchr_inv(hdr->reserved, 0, sizeof(hdr->reserved)))
return -EINVAL;
breq->startino = hdr->ino;
breq->ubuffer = ubuffer;
breq->icount = hdr->icount;
breq->ocount = 0;
breq->flags = 0;
/*
* The @ino parameter is a special value, so we must look it up here.
* We're not allowed to have IREQ_AGNO, and we only return one inode
* worth of data.
*/
if (hdr->flags & XFS_BULK_IREQ_SPECIAL) {
if (hdr->flags & XFS_BULK_IREQ_AGNO)
return -EINVAL;
switch (hdr->ino) {
case XFS_BULK_IREQ_SPECIAL_ROOT:
hdr->ino = mp->m_sb.sb_rootino;
break;
default:
return -EINVAL;
}
breq->icount = 1;
}
/*
* The IREQ_AGNO flag means that we only want results from a given AG.
* If @hdr->ino is zero, we start iterating in that AG. If @hdr->ino is
* beyond the specified AG then we return no results.
*/
if (hdr->flags & XFS_BULK_IREQ_AGNO) {
if (hdr->agno >= mp->m_sb.sb_agcount)
return -EINVAL;
if (breq->startino == 0)
breq->startino = XFS_AGINO_TO_INO(mp, hdr->agno, 0);
else if (XFS_INO_TO_AGNO(mp, breq->startino) < hdr->agno)
return -EINVAL;
breq->flags |= XFS_IBULK_SAME_AG;
/* Asking for an inode past the end of the AG? We're done! */
if (XFS_INO_TO_AGNO(mp, breq->startino) > hdr->agno)
return -ECANCELED;
} else if (hdr->agno)
return -EINVAL;
/* Asking for an inode past the end of the FS? We're done! */
if (XFS_INO_TO_AGNO(mp, breq->startino) >= mp->m_sb.sb_agcount)
return -ECANCELED;
return 0;
}
/*
* Update the userspace bulk request @hdr to reflect the end state of the
* internal bulk request @breq.
*/
static void
xfs_bulk_ireq_teardown(
struct xfs_bulk_ireq *hdr,
struct xfs_ibulk *breq)
{
hdr->ino = breq->startino;
hdr->ocount = breq->ocount;
}
/* Handle the v5 bulkstat ioctl. */
STATIC int
xfs_ioc_bulkstat(
struct xfs_mount *mp,
unsigned int cmd,
struct xfs_bulkstat_req __user *arg)
{
struct xfs_bulk_ireq hdr;
struct xfs_ibulk breq = {
.mp = mp,
};
int error;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
if (copy_from_user(&hdr, &arg->hdr, sizeof(hdr)))
return -EFAULT;
error = xfs_bulk_ireq_setup(mp, &hdr, &breq, arg->bulkstat);
if (error == -ECANCELED)
goto out_teardown;
if (error < 0)
return error;
error = xfs_bulkstat(&breq, xfs_bulkstat_fmt);
if (error)
return error;
out_teardown:
xfs_bulk_ireq_teardown(&hdr, &breq);
if (copy_to_user(&arg->hdr, &hdr, sizeof(hdr)))
return -EFAULT;
return 0;
}
STATIC int
xfs_inumbers_fmt(
struct xfs_ibulk *breq,
const struct xfs_inumbers *igrp)
{
if (copy_to_user(breq->ubuffer, igrp, sizeof(struct xfs_inumbers)))
return -EFAULT;
return xfs_ibulk_advance(breq, sizeof(struct xfs_inumbers));
}
/* Handle the v5 inumbers ioctl. */
STATIC int
xfs_ioc_inumbers(
struct xfs_mount *mp,
unsigned int cmd,
struct xfs_inumbers_req __user *arg)
{
struct xfs_bulk_ireq hdr;
struct xfs_ibulk breq = {
.mp = mp,
};
int error;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
if (copy_from_user(&hdr, &arg->hdr, sizeof(hdr)))
return -EFAULT;
error = xfs_bulk_ireq_setup(mp, &hdr, &breq, arg->inumbers);
if (error == -ECANCELED)
goto out_teardown;
if (error < 0)
return error;
error = xfs_inumbers(&breq, xfs_inumbers_fmt);
if (error)
return error;
out_teardown:
xfs_bulk_ireq_teardown(&hdr, &breq);
if (copy_to_user(&arg->hdr, &hdr, sizeof(hdr)))