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linux/fs/xfs/xfs_ioctl.c
Darrick J. Wong 8ffa90e114 xfs: fix deadlock and streamline xfs_getfsmap performance 
Refactor xfs_getfsmap to improve its performance: instead of indirectly
calling a function that copies one record to userspace at a time, create
a shadow buffer in the kernel and copy the whole array once at the end.
On the author's computer, this reduces the runtime on his /home by ~20%.

This also eliminates a deadlock when running GETFSMAP against the
realtime device.  The current code locks the rtbitmap to create
fsmappings and copies them into userspace, having not released the
rtbitmap lock.  If the userspace buffer is an mmap of a sparse file that
itself resides on the realtime device, the write page fault will recurse
into the fs for allocation, which will deadlock on the rtbitmap lock.

Fixes: 4c934c7dd6 ("xfs: report realtime space information via the rtbitmap")
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
2020-10-07 08:40:29 -07:00

2361 lines
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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 "xfs_reflink.h"
#include "xfs_ioctl.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.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;
}
/*
* Format an attribute and copy it out to the user's buffer.
* Take care to check values and protect against them changing later,
* we may be reading them directly out of a user buffer.
*/
static void
xfs_ioc_attr_put_listent(
struct xfs_attr_list_context *context,
int flags,
unsigned char *name,
int namelen,
int valuelen)
{
struct xfs_attrlist *alist = context->buffer;
struct xfs_attrlist_ent *aep;
int arraytop;
ASSERT(!context->seen_enough);
ASSERT(context->count >= 0);
ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
ASSERT(context->firstu >= sizeof(*alist));
ASSERT(context->firstu <= context->bufsize);
/*
* Only list entries in the right namespace.
*/
if (context->attr_filter != (flags & XFS_ATTR_NSP_ONDISK_MASK))
return;
arraytop = sizeof(*alist) +
context->count * sizeof(alist->al_offset[0]);
/* decrement by the actual bytes used by the attr */
context->firstu -= round_up(offsetof(struct xfs_attrlist_ent, a_name) +
namelen + 1, sizeof(uint32_t));
if (context->firstu < arraytop) {
trace_xfs_attr_list_full(context);
alist->al_more = 1;
context->seen_enough = 1;
return;
}
aep = context->buffer + context->firstu;
aep->a_valuelen = valuelen;
memcpy(aep->a_name, name, namelen);
aep->a_name[namelen] = 0;
alist->al_offset[context->count++] = context->firstu;
alist->al_count = context->count;
trace_xfs_attr_list_add(context);
}
static unsigned int
xfs_attr_filter(
u32 ioc_flags)
{
if (ioc_flags & XFS_IOC_ATTR_ROOT)
return XFS_ATTR_ROOT;
if (ioc_flags & XFS_IOC_ATTR_SECURE)
return XFS_ATTR_SECURE;
return 0;
}
static unsigned int
xfs_attr_flags(
u32 ioc_flags)
{
if (ioc_flags & XFS_IOC_ATTR_CREATE)
return XATTR_CREATE;
if (ioc_flags & XFS_IOC_ATTR_REPLACE)
return XATTR_REPLACE;
return 0;
}
int
xfs_ioc_attr_list(
struct xfs_inode *dp,
void __user *ubuf,
int bufsize,
int flags,
struct xfs_attrlist_cursor __user *ucursor)
{
struct xfs_attr_list_context context = { };
struct xfs_attrlist *alist;
void *buffer;
int error;
if (bufsize < sizeof(struct xfs_attrlist) ||
bufsize > XFS_XATTR_LIST_MAX)
return -EINVAL;
/*
* Reject flags, only allow namespaces.
*/
if (flags & ~(XFS_IOC_ATTR_ROOT | XFS_IOC_ATTR_SECURE))
return -EINVAL;
if (flags == (XFS_IOC_ATTR_ROOT | XFS_IOC_ATTR_SECURE))
return -EINVAL;
/*
* Validate the cursor.
*/
if (copy_from_user(&context.cursor, ucursor, sizeof(context.cursor)))
return -EFAULT;
if (context.cursor.pad1 || context.cursor.pad2)
return -EINVAL;
if (!context.cursor.initted &&
(context.cursor.hashval || context.cursor.blkno ||
context.cursor.offset))
return -EINVAL;
buffer = kvzalloc(bufsize, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
/*
* Initialize the output buffer.
*/
context.dp = dp;
context.resynch = 1;
context.attr_filter = xfs_attr_filter(flags);
context.buffer = buffer;
context.bufsize = round_down(bufsize, sizeof(uint32_t));
context.firstu = context.bufsize;
context.put_listent = xfs_ioc_attr_put_listent;
alist = context.buffer;
alist->al_count = 0;
alist->al_more = 0;
alist->al_offset[0] = context.bufsize;
error = xfs_attr_list(&context);
if (error)
goto out_free;
if (copy_to_user(ubuf, buffer, bufsize) ||
copy_to_user(ucursor, &context.cursor, sizeof(context.cursor)))
error = -EFAULT;
out_free:
kmem_free(buffer);
return error;
}
STATIC int
xfs_attrlist_by_handle(
struct file *parfilp,
struct xfs_fsop_attrlist_handlereq __user *p)
{
struct xfs_fsop_attrlist_handlereq al_hreq;
struct dentry *dentry;
int error = -ENOMEM;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&al_hreq, p, sizeof(al_hreq)))
return -EFAULT;
dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
error = xfs_ioc_attr_list(XFS_I(d_inode(dentry)), al_hreq.buffer,
al_hreq.buflen, al_hreq.flags, &p->pos);
dput(dentry);
return error;
}
static int
xfs_attrmulti_attr_get(
struct inode *inode,
unsigned char *name,
unsigned char __user *ubuf,
uint32_t *len,
uint32_t flags)
{
struct xfs_da_args args = {
.dp = XFS_I(inode),
.attr_filter = xfs_attr_filter(flags),
.attr_flags = xfs_attr_flags(flags),
.name = name,
.namelen = strlen(name),
.valuelen = *len,
};
int error;
if (*len > XFS_XATTR_SIZE_MAX)
return -EINVAL;
error = xfs_attr_get(&args);
if (error)
goto out_kfree;
*len = args.valuelen;
if (copy_to_user(ubuf, args.value, args.valuelen))
error = -EFAULT;
out_kfree:
kmem_free(args.value);
return error;
}
static int
xfs_attrmulti_attr_set(
struct inode *inode,
unsigned char *name,
const unsigned char __user *ubuf,
uint32_t len,
uint32_t flags)
{
struct xfs_da_args args = {
.dp = XFS_I(inode),
.attr_filter = xfs_attr_filter(flags),
.attr_flags = xfs_attr_flags(flags),
.name = name,
.namelen = strlen(name),
};
int error;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EPERM;
if (ubuf) {
if (len > XFS_XATTR_SIZE_MAX)
return -EINVAL;
args.value = memdup_user(ubuf, len);
if (IS_ERR(args.value))
return PTR_ERR(args.value);
args.valuelen = len;
}
error = xfs_attr_set(&args);
if (!error && (flags & XFS_IOC_ATTR_ROOT))
xfs_forget_acl(inode, name);
kfree(args.value);
return error;
}
int
xfs_ioc_attrmulti_one(
struct file *parfilp,
struct inode *inode,
uint32_t opcode,
void __user *uname,
void __user *value,
uint32_t *len,
uint32_t flags)
{
unsigned char *name;
int error;
if ((flags & XFS_IOC_ATTR_ROOT) && (flags & XFS_IOC_ATTR_SECURE))
return -EINVAL;
name = strndup_user(uname, MAXNAMELEN);
if (IS_ERR(name))
return PTR_ERR(name);
switch (opcode) {
case ATTR_OP_GET:
error = xfs_attrmulti_attr_get(inode, name, value, len, flags);
break;
case ATTR_OP_REMOVE:
value = NULL;
*len = 0;
/* fall through */
case ATTR_OP_SET:
error = mnt_want_write_file(parfilp);
if (error)
break;
error = xfs_attrmulti_attr_set(inode, name, value, *len, flags);
mnt_drop_write_file(parfilp);
break;
default:
error = -EINVAL;
break;
}
kfree(name);
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;
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 = 0;
for (i = 0; i < am_hreq.opcount; i++) {
ops[i].am_error = xfs_ioc_attrmulti_one(parfilp,
d_inode(dentry), ops[i].am_opcode,
ops[i].am_attrname, ops[i].am_attrvalue,
&ops[i].am_length, ops[i].am_flags);
}
if (copy_to_user(am_hreq.ops, ops, size))
error = -EFAULT;
kfree(ops);
out_dput:
dput(dentry);
return error;
}
int
xfs_ioc_space(
struct file *filp,
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 = XFS_PREALLOC_CLEAR;
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 (xfs_is_always_cow_inode(ip))
return -EOPNOTSUPP;
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;
inode_dio_wait(inode);
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;
}
if (bf->l_start < 0 || bf->l_start > inode->i_sb->s_maxbytes) {
error = -EINVAL;
goto out_unlock;
}
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);
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)))
return -EFAULT;
return 0;
}
STATIC int
xfs_ioc_fsgeometry(
struct xfs_mount *mp,
void __user *arg,
int struct_version)
{
struct xfs_fsop_geom fsgeo;
size_t len;
xfs_fs_geometry(&mp->m_sb, &fsgeo, struct_version);
if (struct_version <= 3)
len = sizeof(struct xfs_fsop_geom_v1);
else if (struct_version == 4)
len = sizeof(struct xfs_fsop_geom_v4);
else {
xfs_fsop_geom_health(mp, &fsgeo);
len = sizeof(fsgeo);
}
if (copy_to_user(arg, &fsgeo, len))
return -EFAULT;
return 0;
}
STATIC int
xfs_ioc_ag_geometry(
struct xfs_mount *mp,
void __user *arg)
{
struct xfs_ag_geometry ageo;
int error;
if (copy_from_user(&ageo, arg, sizeof(ageo)))
return -EFAULT;
if (ageo.ag_flags)
return -EINVAL;
if (memchr_inv(&ageo.ag_reserved, 0, sizeof(ageo.ag_reserved)))
return -EINVAL;
error = xfs_ag_get_geometry(mp, ageo.ag_number, &ageo);
if (error)
return error;
if (copy_to_user(arg, &ageo, sizeof(ageo)))
return -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 |= FS_XFLAG_IMMUTABLE;
else
xflags &= ~FS_XFLAG_IMMUTABLE;
if (flags & FS_APPEND_FL)
xflags |= FS_XFLAG_APPEND;
else
xflags &= ~FS_XFLAG_APPEND;
if (flags & FS_SYNC_FL)
xflags |= FS_XFLAG_SYNC;
else
xflags &= ~FS_XFLAG_SYNC;
if (flags & FS_NOATIME_FL)
xflags |= FS_XFLAG_NOATIME;
else
xflags &= ~FS_XFLAG_NOATIME;
if (flags & FS_NODUMP_FL)
xflags |= FS_XFLAG_NODUMP;
else
xflags &= ~FS_XFLAG_NODUMP;
if (flags & FS_DAX_FL)
xflags |= FS_XFLAG_DAX;
else
xflags &= ~FS_XFLAG_DAX;
return xflags;
}
STATIC unsigned int
xfs_di2lxflags(
uint16_t di_flags,
uint64_t di_flags2)
{
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;
if (di_flags2 & XFS_DIFLAG2_DAX) {
flags |= FS_DAX_FL;
}
return flags;
}
static void
xfs_fill_fsxattr(
struct xfs_inode *ip,
bool attr,
struct fsxattr *fa)
{
struct xfs_ifork *ifp = attr ? ip->i_afp : &ip->i_df;
simple_fill_fsxattr(fa, xfs_ip2xflags(ip));
fa->fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
fa->fsx_cowextsize = ip->i_d.di_cowextsize <<
ip->i_mount->m_sb.sb_blocklog;
fa->fsx_projid = ip->i_d.di_projid;
if (ifp && (ifp->if_flags & XFS_IFEXTENTS))
fa->fsx_nextents = xfs_iext_count(ifp);
else
fa->fsx_nextents = xfs_ifork_nextents(ifp);
}
STATIC int
xfs_ioc_fsgetxattr(
xfs_inode_t *ip,
int attr,
void __user *arg)
{
struct fsxattr fa;
xfs_ilock(ip, XFS_ILOCK_SHARED);
xfs_fill_fsxattr(ip, attr, &fa);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (copy_to_user(arg, &fa, sizeof(fa)))
return -EFAULT;
return 0;
}
STATIC uint16_t
xfs_flags2diflags(
struct xfs_inode *ip,
unsigned int xflags)
{
/* can't set PREALLOC this way, just preserve it */
uint16_t di_flags =
(ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
if (xflags & FS_XFLAG_IMMUTABLE)
di_flags |= XFS_DIFLAG_IMMUTABLE;
if (xflags & FS_XFLAG_APPEND)
di_flags |= XFS_DIFLAG_APPEND;
if (xflags & FS_XFLAG_SYNC)
di_flags |= XFS_DIFLAG_SYNC;
if (xflags & FS_XFLAG_NOATIME)
di_flags |= XFS_DIFLAG_NOATIME;
if (xflags & FS_XFLAG_NODUMP)
di_flags |= XFS_DIFLAG_NODUMP;
if (xflags & FS_XFLAG_NODEFRAG)
di_flags |= XFS_DIFLAG_NODEFRAG;
if (xflags & FS_XFLAG_FILESTREAM)
di_flags |= XFS_DIFLAG_FILESTREAM;
if (S_ISDIR(VFS_I(ip)->i_mode)) {
if (xflags & FS_XFLAG_RTINHERIT)
di_flags |= XFS_DIFLAG_RTINHERIT;
if (xflags & FS_XFLAG_NOSYMLINKS)
di_flags |= XFS_DIFLAG_NOSYMLINKS;
if (xflags & FS_XFLAG_EXTSZINHERIT)
di_flags |= XFS_DIFLAG_EXTSZINHERIT;
if (xflags & FS_XFLAG_PROJINHERIT)
di_flags |= XFS_DIFLAG_PROJINHERIT;
} else if (S_ISREG(VFS_I(ip)->i_mode)) {
if (xflags & FS_XFLAG_REALTIME)
di_flags |= XFS_DIFLAG_REALTIME;
if (xflags & FS_XFLAG_EXTSIZE)
di_flags |= XFS_DIFLAG_EXTSIZE;
}
return di_flags;
}
STATIC uint64_t
xfs_flags2diflags2(
struct xfs_inode *ip,
unsigned int xflags)
{
uint64_t di_flags2 =
(ip->i_d.di_flags2 & (XFS_DIFLAG2_REFLINK |
XFS_DIFLAG2_BIGTIME));
if (xflags & FS_XFLAG_DAX)
di_flags2 |= XFS_DIFLAG2_DAX;
if (xflags & FS_XFLAG_COWEXTSIZE)
di_flags2 |= XFS_DIFLAG2_COWEXTSIZE;
return di_flags2;
}
static int
xfs_ioctl_setattr_xflags(
struct xfs_trans *tp,
struct xfs_inode *ip,
struct fsxattr *fa)
{
struct xfs_mount *mp = ip->i_mount;
uint64_t di_flags2;
/* Can't change realtime flag if any extents are allocated. */
if ((ip->i_df.if_nextents || ip->i_delayed_blks) &&
XFS_IS_REALTIME_INODE(ip) != (fa->fsx_xflags & FS_XFLAG_REALTIME))
return -EINVAL;
/* If realtime flag is set then must have realtime device */
if (fa->fsx_xflags & FS_XFLAG_REALTIME) {
if (mp->m_sb.sb_rblocks == 0 || mp->m_sb.sb_rextsize == 0 ||
(ip->i_d.di_extsize % mp->m_sb.sb_rextsize))
return -EINVAL;
}
/* Clear reflink if we are actually able to set the rt flag. */
if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip))
ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
/* Don't allow us to set DAX mode for a reflinked file for now. */
if ((fa->fsx_xflags & FS_XFLAG_DAX) && xfs_is_reflink_inode(ip))
return -EINVAL;
/* diflags2 only valid for v3 inodes. */
di_flags2 = xfs_flags2diflags2(ip, fa->fsx_xflags);
if (di_flags2 && !xfs_sb_version_has_v3inode(&mp->m_sb))
return -EINVAL;
ip->i_d.di_flags = xfs_flags2diflags(ip, fa->fsx_xflags);
ip->i_d.di_flags2 = di_flags2;
xfs_diflags_to_iflags(ip, false);
xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
XFS_STATS_INC(mp, xs_ig_attrchg);
return 0;
}
static void
xfs_ioctl_setattr_prepare_dax(
struct xfs_inode *ip,
struct fsxattr *fa)
{
struct xfs_mount *mp = ip->i_mount;
struct inode *inode = VFS_I(ip);
if (S_ISDIR(inode->i_mode))
return;
if ((mp->m_flags & XFS_MOUNT_DAX_ALWAYS) ||
(mp->m_flags & XFS_MOUNT_DAX_NEVER))
return;
if (((fa->fsx_xflags & FS_XFLAG_DAX) &&
!(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) ||
(!(fa->fsx_xflags & FS_XFLAG_DAX) &&
(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)))
d_mark_dontcache(inode);
}
/*
* Set up the transaction structure for the setattr operation, checking that we
* have permission to do so. On success, return a clean transaction and the
* inode locked exclusively ready for further operation specific checks. On
* failure, return an error without modifying or locking the inode.
*/
static struct xfs_trans *
xfs_ioctl_setattr_get_trans(
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
int error = -EROFS;
if (mp->m_flags & XFS_MOUNT_RDONLY)
goto out_unlock;
error = -EIO;
if (XFS_FORCED_SHUTDOWN(mp))
goto out_unlock;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
if (error)
goto out_unlock;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
/*
* CAP_FOWNER overrides the following restrictions:
*
* The user ID of the calling process must be equal to the file owner
* ID, except in cases where the CAP_FSETID capability is applicable.
*/
if (!inode_owner_or_capable(VFS_I(ip))) {
error = -EPERM;
goto out_cancel;
}
if (mp->m_flags & XFS_MOUNT_WSYNC)
xfs_trans_set_sync(tp);
return tp;
out_cancel:
xfs_trans_cancel(tp);
out_unlock:
return ERR_PTR(error);
}
/*
* extent size hint validation is somewhat cumbersome. Rules are:
*
* 1. extent size hint is only valid for directories and regular files
* 2. FS_XFLAG_EXTSIZE is only valid for regular files
* 3. FS_XFLAG_EXTSZINHERIT is only valid for directories.
* 4. can only be changed on regular files if no extents are allocated
* 5. can be changed on directories at any time
* 6. extsize hint of 0 turns off hints, clears inode flags.
* 7. Extent size must be a multiple of the appropriate block size.
* 8. for non-realtime files, the extent size hint must be limited
* to half the AG size to avoid alignment extending the extent beyond the
* limits of the AG.
*
* Please keep this function in sync with xfs_scrub_inode_extsize.
*/
static int
xfs_ioctl_setattr_check_extsize(
struct xfs_inode *ip,
struct fsxattr *fa)
{
struct xfs_mount *mp = ip->i_mount;
xfs_extlen_t size;
xfs_fsblock_t extsize_fsb;
if (S_ISREG(VFS_I(ip)->i_mode) && ip->i_df.if_nextents &&
((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != fa->fsx_extsize))
return -EINVAL;
if (fa->fsx_extsize == 0)
return 0;
extsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_extsize);
if (extsize_fsb > MAXEXTLEN)
return -EINVAL;
if (XFS_IS_REALTIME_INODE(ip) ||
(fa->fsx_xflags & FS_XFLAG_REALTIME)) {
size = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
} else {
size = mp->m_sb.sb_blocksize;
if (extsize_fsb > mp->m_sb.sb_agblocks / 2)
return -EINVAL;
}
if (fa->fsx_extsize % size)
return -EINVAL;
return 0;
}
/*
* CoW extent size hint validation rules are:
*
* 1. CoW extent size hint can only be set if reflink is enabled on the fs.
* The inode does not have to have any shared blocks, but it must be a v3.
* 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files;
* for a directory, the hint is propagated to new files.
* 3. Can be changed on files & directories at any time.
* 4. CoW extsize hint of 0 turns off hints, clears inode flags.
* 5. Extent size must be a multiple of the appropriate block size.
* 6. The extent size hint must be limited to half the AG size to avoid
* alignment extending the extent beyond the limits of the AG.
*
* Please keep this function in sync with xfs_scrub_inode_cowextsize.
*/
static int
xfs_ioctl_setattr_check_cowextsize(
struct xfs_inode *ip,
struct fsxattr *fa)
{
struct xfs_mount *mp = ip->i_mount;
xfs_extlen_t size;
xfs_fsblock_t cowextsize_fsb;
if (!(fa->fsx_xflags & FS_XFLAG_COWEXTSIZE))
return 0;
if (!xfs_sb_version_hasreflink(&ip->i_mount->m_sb))
return -EINVAL;
if (fa->fsx_cowextsize == 0)
return 0;
cowextsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_cowextsize);
if (cowextsize_fsb > MAXEXTLEN)
return -EINVAL;
size = mp->m_sb.sb_blocksize;
if (cowextsize_fsb > mp->m_sb.sb_agblocks / 2)
return -EINVAL;
if (fa->fsx_cowextsize % size)
return -EINVAL;
return 0;
}
static int
xfs_ioctl_setattr_check_projid(
struct xfs_inode *ip,
struct fsxattr *fa)
{
/* Disallow 32bit project ids if projid32bit feature is not enabled. */
if (fa->fsx_projid > (uint16_t)-1 &&
!xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb))
return -EINVAL;
return 0;
}
STATIC int
xfs_ioctl_setattr(
xfs_inode_t *ip,
struct fsxattr *fa)
{
struct fsxattr old_fa;
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
struct xfs_dquot *pdqp = NULL;
struct xfs_dquot *olddquot = NULL;
int code;
trace_xfs_ioctl_setattr(ip);
code = xfs_ioctl_setattr_check_projid(ip, fa);
if (code)
return code;
/*
* If disk quotas is on, we make sure that the dquots do exist on disk,
* before we start any other transactions. Trying to do this later
* is messy. We don't care to take a readlock to look at the ids
* in inode here, because we can't hold it across the trans_reserve.
* If the IDs do change before we take the ilock, we're covered
* because the i_*dquot fields will get updated anyway.
*/
if (XFS_IS_QUOTA_ON(mp)) {
code = xfs_qm_vop_dqalloc(ip, VFS_I(ip)->i_uid,
VFS_I(ip)->i_gid, fa->fsx_projid,
XFS_QMOPT_PQUOTA, NULL, NULL, &pdqp);
if (code)
return code;
}
xfs_ioctl_setattr_prepare_dax(ip, fa);
tp = xfs_ioctl_setattr_get_trans(ip);
if (IS_ERR(tp)) {
code = PTR_ERR(tp);
goto error_free_dquots;
}
if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp) &&
ip->i_d.di_projid != fa->fsx_projid) {
code = xfs_qm_vop_chown_reserve(tp, ip, NULL, NULL, pdqp,
capable(CAP_FOWNER) ? XFS_QMOPT_FORCE_RES : 0);
if (code) /* out of quota */
goto error_trans_cancel;
}
xfs_fill_fsxattr(ip, false, &old_fa);
code = vfs_ioc_fssetxattr_check(VFS_I(ip), &old_fa, fa);
if (code)
goto error_trans_cancel;
code = xfs_ioctl_setattr_check_extsize(ip, fa);
if (code)
goto error_trans_cancel;
code = xfs_ioctl_setattr_check_cowextsize(ip, fa);
if (code)
goto error_trans_cancel;
code = xfs_ioctl_setattr_xflags(tp, ip, fa);
if (code)
goto error_trans_cancel;
/*
* Change file ownership. Must be the owner or privileged. CAP_FSETID
* overrides the following restrictions:
*
* The set-user-ID and set-group-ID bits of a file will be cleared upon
* successful return from chown()
*/
if ((VFS_I(ip)->i_mode & (S_ISUID|S_ISGID)) &&
!capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID))
VFS_I(ip)->i_mode &= ~(S_ISUID|S_ISGID);
/* Change the ownerships and register project quota modifications */
if (ip->i_d.di_projid != fa->fsx_projid) {
if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) {
olddquot = xfs_qm_vop_chown(tp, ip,
&ip->i_pdquot, pdqp);
}
ip->i_d.di_projid = fa->fsx_projid;
}
/*
* Only set the extent size hint if we've already determined that the
* extent size hint should be set on the inode. If no extent size flags
* are set on the inode then unconditionally clear the extent size hint.
*/
if (ip->i_d.di_flags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT))
ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
else
ip->i_d.di_extsize = 0;
if (xfs_sb_version_has_v3inode(&mp->m_sb) &&
(ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE))
ip->i_d.di_cowextsize = fa->fsx_cowextsize >>
mp->m_sb.sb_blocklog;
else
ip->i_d.di_cowextsize = 0;
code = xfs_trans_commit(tp);
/*
* Release any dquot(s) the inode had kept before chown.
*/
xfs_qm_dqrele(olddquot);
xfs_qm_dqrele(pdqp);
return code;
error_trans_cancel:
xfs_trans_cancel(tp);
error_free_dquots:
xfs_qm_dqrele(pdqp);
return code;
}
STATIC int
xfs_ioc_fssetxattr(
xfs_inode_t *ip,
struct file *filp,
void __user *arg)
{
struct fsxattr fa;
int error;
if (copy_from_user(&fa, arg, sizeof(fa)))
return -EFAULT;
error = mnt_want_write_file(filp);
if (error)
return error;
error = xfs_ioctl_setattr(ip, &fa);
mnt_drop_write_file(filp);
return error;
}
STATIC int
xfs_ioc_getxflags(
xfs_inode_t *ip,
void __user *arg)
{
unsigned int flags;
flags = xfs_di2lxflags(ip->i_d.di_flags, ip->i_d.di_flags2);
if (copy_to_user(arg, &flags, sizeof(flags)))
return -EFAULT;
return 0;
}
STATIC int
xfs_ioc_setxflags(
struct xfs_inode *ip,
struct file *filp,
void __user *arg)
{
struct xfs_trans *tp;
struct fsxattr fa;
struct fsxattr old_fa;
unsigned int flags;
int error;
if (copy_from_user(&flags, arg, sizeof(flags)))
return -EFAULT;
if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
FS_NOATIME_FL | FS_NODUMP_FL | \
FS_SYNC_FL | FS_DAX_FL))
return -EOPNOTSUPP;
fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));
error = mnt_want_write_file(filp);
if (error)
return error;
xfs_ioctl_setattr_prepare_dax(ip, &fa);
tp = xfs_ioctl_setattr_get_trans(ip);
if (IS_ERR(tp)) {
error = PTR_ERR(tp);
goto out_drop_write;
}
xfs_fill_fsxattr(ip, false, &old_fa);
error = vfs_ioc_fssetxattr_check(VFS_I(ip), &old_fa, &fa);
if (error) {
xfs_trans_cancel(tp);
goto out_drop_write;
}
error = xfs_ioctl_setattr_xflags(tp, ip, &fa);
if (error) {
xfs_trans_cancel(tp);
goto out_drop_write;
}
error = xfs_trans_commit(tp);
out_drop_write:
mnt_drop_write_file(filp);
return error;
}
static bool
xfs_getbmap_format(
struct kgetbmap *p,
struct getbmapx __user *u,
size_t recsize)
{
if (put_user(p->bmv_offset, &u->bmv_offset) ||
put_user(p->bmv_block, &u->bmv_block) ||
put_user(p->bmv_length, &u->bmv_length) ||
put_user(0, &u->bmv_count) ||
put_user(0, &u->bmv_entries))
return false;
if (recsize < sizeof(struct getbmapx))
return true;
if (put_user(0, &u->bmv_iflags) ||
put_user(p->bmv_oflags, &u->bmv_oflags) ||
put_user(0, &u->bmv_unused1) ||
put_user(0, &u->bmv_unused2))
return false;
return true;
}
STATIC int
xfs_ioc_getbmap(
struct file *file,
unsigned int cmd,
void __user *arg)
{
struct getbmapx bmx = { 0 };
struct kgetbmap *buf;
size_t recsize;
int error, i;
switch (cmd) {
case XFS_IOC_GETBMAPA:
bmx.bmv_iflags = BMV_IF_ATTRFORK;
/*FALLTHRU*/
case XFS_IOC_GETBMAP:
if (file->f_mode & FMODE_NOCMTIME)
bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
/* struct getbmap is a strict subset of struct getbmapx. */
recsize = sizeof(struct getbmap);
break;
case XFS_IOC_GETBMAPX:
recsize = sizeof(struct getbmapx);
break;
default:
return -EINVAL;
}
if (copy_from_user(&bmx, arg, recsize))
return -EFAULT;
if (bmx.bmv_count < 2)
return -EINVAL;
if (bmx.bmv_count > ULONG_MAX / recsize)
return -ENOMEM;
buf = kvzalloc(bmx.bmv_count * sizeof(*buf), GFP_KERNEL);
if (!buf)
return -ENOMEM;
error = xfs_getbmap(XFS_I(file_inode(file)), &bmx, buf);
if (error)
goto out_free_buf;
error = -EFAULT;
if (copy_to_user(arg, &bmx, recsize))
goto out_free_buf;
arg += recsize;
for (i = 0; i < bmx.bmv_entries; i++) {
if (!xfs_getbmap_format(buf + i, arg, recsize))
goto out_free_buf;
arg += recsize;
}
error = 0;
out_free_buf:
kmem_free(buf);
return error;
}
STATIC int
xfs_ioc_getfsmap(
struct xfs_inode *ip,
struct fsmap_head __user *arg)
{
struct xfs_fsmap_head xhead = {0};
struct fsmap_head head;
struct fsmap *recs;
unsigned int count;
__u32 last_flags = 0;
bool done = false;
int error;
if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
return -EFAULT;
if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
sizeof(head.fmh_keys[0].fmr_reserved)) ||
memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
sizeof(head.fmh_keys[1].fmr_reserved)))
return -EINVAL;
/*
* Use an internal memory buffer so that we don't have to copy fsmap
* data to userspace while holding locks. Start by trying to allocate
* up to 128k for the buffer, but fall back to a single page if needed.
*/
count = min_t(unsigned int, head.fmh_count,
131072 / sizeof(struct fsmap));
recs = kvzalloc(count * sizeof(struct fsmap), GFP_KERNEL);
if (!recs) {
count = min_t(unsigned int, head.fmh_count,
PAGE_SIZE / sizeof(struct fsmap));
recs = kvzalloc(count * sizeof(struct fsmap), GFP_KERNEL);
if (!recs)
return -ENOMEM;
}
xhead.fmh_iflags = head.fmh_iflags;
xfs_fsmap_to_internal(&xhead.fmh_keys[0], &head.fmh_keys[0]);
xfs_fsmap_to_internal(&xhead.fmh_keys[1], &head.fmh_keys[1]);
trace_xfs_getfsmap_low_key(ip->i_mount, &xhead.fmh_keys[0]);
trace_xfs_getfsmap_high_key(ip->i_mount, &xhead.fmh_keys[1]);
head.fmh_entries = 0;
do {
struct fsmap __user *user_recs;
struct fsmap *last_rec;
user_recs = &arg->fmh_recs[head.fmh_entries];
xhead.fmh_entries = 0;
xhead.fmh_count = min_t(unsigned int, count,
head.fmh_count - head.fmh_entries);
/* Run query, record how many entries we got. */
error = xfs_getfsmap(ip->i_mount, &xhead, recs);
switch (error) {
case 0:
/*
* There are no more records in the result set. Copy
* whatever we got to userspace and break out.
*/
done = true;
break;
case -ECANCELED:
/*
* The internal memory buffer is full. Copy whatever
* records we got to userspace and go again if we have
* not yet filled the userspace buffer.
*/
error = 0;
break;
default:
goto out_free;
}
head.fmh_entries += xhead.fmh_entries;
head.fmh_oflags = xhead.fmh_oflags;
/*
* If the caller wanted a record count or there aren't any
* new records to return, we're done.
*/
if (head.fmh_count == 0 || xhead.fmh_entries == 0)
break;
/* Copy all the records we got out to userspace. */
if (copy_to_user(user_recs, recs,
xhead.fmh_entries * sizeof(struct fsmap))) {
error = -EFAULT;
goto out_free;
}
/* Remember the last record flags we copied to userspace. */
last_rec = &recs[xhead.fmh_entries - 1];
last_flags = last_rec->fmr_flags;
/* Set up the low key for the next iteration. */
xfs_fsmap_to_internal(&xhead.fmh_keys[0], last_rec);
trace_xfs_getfsmap_low_key(ip->i_mount, &xhead.fmh_keys[0]);
} while (!done && head.fmh_entries < head.fmh_count);
/*
* If there are no more records in the query result set and we're not
* in counting mode, mark the last record returned with the LAST flag.
*/
if (done && head.fmh_count > 0 && head.fmh_entries > 0) {
struct fsmap __user *user_rec;
last_flags |= FMR_OF_LAST;
user_rec = &arg->fmh_recs[head.fmh_entries - 1];
if (copy_to_user(&user_rec->fmr_flags, &last_flags,
sizeof(last_flags))) {
error = -EFAULT;
goto out_free;
}
}
/* copy back header */
if (copy_to_user(arg, &head, sizeof(struct fsmap_head))) {
error = -EFAULT;
goto out_free;
}
out_free:
kmem_free(recs);
return error;
}
STATIC int
xfs_ioc_scrub_metadata(
struct xfs_inode *ip,
void __user *arg)
{
struct xfs_scrub_metadata scrub;
int error;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&scrub, arg, sizeof(scrub)))
return -EFAULT;
error = xfs_scrub_metadata(ip, &scrub);
if (error)
return error;
if (copy_to_user(arg, &scrub, sizeof(scrub)))
return -EFAULT;
return 0;
}
int
xfs_ioc_swapext(
xfs_swapext_t *sxp)
{
xfs_inode_t *ip, *tip;
struct fd f, tmp;
int error = 0;
/* Pull information for the target fd */
f = fdget((int)sxp->sx_fdtarget);
if (!f.file) {
error = -EINVAL;
goto out;
}
if (!(f.file->f_mode & FMODE_WRITE) ||
!(f.file->f_mode & FMODE_READ) ||
(f.file->f_flags & O_APPEND)) {
error = -EBADF;
goto out_put_file;
}
tmp = fdget((int)sxp->sx_fdtmp);
if (!tmp.file) {
error = -EINVAL;
goto out_put_file;
}
if (!(tmp.file->f_mode & FMODE_WRITE) ||
!(tmp.file->f_mode & FMODE_READ) ||
(tmp.file->f_flags & O_APPEND)) {
error = -EBADF;
goto out_put_tmp_file;
}
if (IS_SWAPFILE(file_inode(f.file)) ||
IS_SWAPFILE(file_inode(tmp.file))) {
error = -EINVAL;
goto out_put_tmp_file;
}
/*
* We need to ensure that the fds passed in point to XFS inodes
* before we cast and access them as XFS structures as we have no
* control over what the user passes us here.
*/
if (f.file->f_op != &xfs_file_operations ||
tmp.file->f_op != &xfs_file_operations) {
error = -EINVAL;
goto out_put_tmp_file;
}
ip = XFS_I(file_inode(f.file));
tip = XFS_I(file_inode(tmp.file));
if (ip->i_mount != tip->i_mount) {
error = -EINVAL;
goto out_put_tmp_file;
}
if (ip->i_ino == tip->i_ino) {
error = -EINVAL;
goto out_put_tmp_file;
}
if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
error = -EIO;
goto out_put_tmp_file;
}
error = xfs_swap_extents(ip, tip, sxp);
out_put_tmp_file:
fdput(tmp);
out_put_file:
fdput(f);
out:
return error;
}
static int
xfs_ioc_getlabel(
struct xfs_mount *mp,
char __user *user_label)
{
struct xfs_sb *sbp = &mp->m_sb;
char label[XFSLABEL_MAX + 1];
/* Paranoia */
BUILD_BUG_ON(sizeof(sbp->sb_fname) > FSLABEL_MAX);
/* 1 larger than sb_fname, so this ensures a trailing NUL char */
memset(label, 0, sizeof(label));
spin_lock(&mp->m_sb_lock);
strncpy(label, sbp->sb_fname, XFSLABEL_MAX);
spin_unlock(&mp->m_sb_lock);
if (copy_to_user(user_label, label, sizeof(label)))
return -EFAULT;
return 0;
}
static int
xfs_ioc_setlabel(
struct file *filp,
struct xfs_mount *mp,
char __user *newlabel)
{
struct xfs_sb *sbp = &mp->m_sb;
char label[XFSLABEL_MAX + 1];
size_t len;
int error;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
/*
* The generic ioctl allows up to FSLABEL_MAX chars, but XFS is much
* smaller, at 12 bytes. We copy one more to be sure we find the
* (required) NULL character to test the incoming label length.
* NB: The on disk label doesn't need to be null terminated.
*/
if (copy_from_user(label, newlabel, XFSLABEL_MAX + 1))
return -EFAULT;
len = strnlen(label, XFSLABEL_MAX + 1);
if (len > sizeof(sbp->sb_fname))
return -EINVAL;
error = mnt_want_write_file(filp);
if (error)
return error;
spin_lock(&mp->m_sb_lock);
memset(sbp->sb_fname, 0, sizeof(sbp->sb_fname));
memcpy(sbp->sb_fname, label, len);
spin_unlock(&mp->m_sb_lock);
/*
* Now we do several things to satisfy userspace.
* In addition to normal logging of the primary superblock, we also
* immediately write these changes to sector zero for the primary, then
* update all backup supers (as xfs_db does for a label change), then
* invalidate the block device page cache. This is so that any prior
* buffered reads from userspace (i.e. from blkid) are invalidated,
* and userspace will see the newly-written label.
*/
error = xfs_sync_sb_buf(mp);
if (error)
goto out;
/*
* growfs also updates backup supers so lock against that.
*/
mutex_lock(&mp->m_growlock);
error = xfs_update_secondary_sbs(mp);
mutex_unlock(&mp->m_growlock);
invalidate_bdev(mp->m_ddev_targp->bt_bdev);
out:
mnt_drop_write_file(filp);
return error;
}
static inline int
xfs_fs_eofblocks_from_user(
struct xfs_fs_eofblocks *src,
struct xfs_eofblocks *dst)
{
if (src->eof_version != XFS_EOFBLOCKS_VERSION)
return -EINVAL;
if (src->eof_flags & ~XFS_EOF_FLAGS_VALID)
return -EINVAL;
if (memchr_inv(&src->pad32, 0, sizeof(src->pad32)) ||
memchr_inv(src->pad64, 0, sizeof(src->pad64)))
return -EINVAL;
dst->eof_flags = src->eof_flags;
dst->eof_prid = src->eof_prid;
dst->eof_min_file_size = src->eof_min_file_size;
dst->eof_uid = INVALID_UID;
if (src->eof_flags & XFS_EOF_FLAGS_UID) {
dst->eof_uid = make_kuid(current_user_ns(), src->eof_uid);
if (!uid_valid(dst->eof_uid))
return -EINVAL;
}
dst->eof_gid = INVALID_GID;
if (src->eof_flags & XFS_EOF_FLAGS_GID) {
dst->eof_gid = make_kgid(current_user_ns(), src->eof_gid);
if (!gid_valid(dst->eof_gid))
return -EINVAL;
}
return 0;
}
/*
* Note: some of the ioctl's return positive numbers as a
* byte count indicating success, such as readlink_by_handle.
* So we don't "sign flip" like most other routines. This means
* true errors need to be returned as a negative value.
*/
long
xfs_file_ioctl(
struct file *filp,
unsigned int cmd,
unsigned long p)
{
struct inode *inode = file_inode(filp);
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
void __user *arg = (void __user *)p;
int error;
trace_xfs_file_ioctl(ip);
switch (cmd) {
case FITRIM:
return xfs_ioc_trim(mp, arg);
case FS_IOC_GETFSLABEL:
return xfs_ioc_getlabel(mp, arg);
case FS_IOC_SETFSLABEL:
return xfs_ioc_setlabel(filp, mp, arg);
case XFS_IOC_ALLOCSP:
case XFS_IOC_FREESP:
case XFS_IOC_ALLOCSP64:
case XFS_IOC_FREESP64: {
xfs_flock64_t bf;
if (copy_from_user(&bf, arg, sizeof(bf)))
return -EFAULT;
return xfs_ioc_space(filp, &bf);
}
case XFS_IOC_DIOINFO: {
struct xfs_buftarg *target = xfs_inode_buftarg(ip);
struct dioattr da;
da.d_mem = da.d_miniosz = target->bt_logical_sectorsize;
da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
if (copy_to_user(arg, &da, sizeof(da)))
return -EFAULT;
return 0;
}
case XFS_IOC_FSBULKSTAT_SINGLE:
case XFS_IOC_FSBULKSTAT:
case XFS_IOC_FSINUMBERS:
return xfs_ioc_fsbulkstat(mp, cmd, arg);
case XFS_IOC_BULKSTAT:
return xfs_ioc_bulkstat(mp, cmd, arg);
case XFS_IOC_INUMBERS:
return xfs_ioc_inumbers(mp, cmd, arg);
case XFS_IOC_FSGEOMETRY_V1:
return xfs_ioc_fsgeometry(mp, arg, 3);
case XFS_IOC_FSGEOMETRY_V4:
return xfs_ioc_fsgeometry(mp, arg, 4);
case XFS_IOC_FSGEOMETRY:
return xfs_ioc_fsgeometry(mp, arg, 5);
case XFS_IOC_AG_GEOMETRY:
return xfs_ioc_ag_geometry(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_FSSETXATTR:
return xfs_ioc_fssetxattr(ip, filp, arg);
case XFS_IOC_GETXFLAGS:
return xfs_ioc_getxflags(ip, arg);
case XFS_IOC_SETXFLAGS:
return xfs_ioc_setxflags(ip, filp, arg);
case XFS_IOC_GETBMAP:
case XFS_IOC_GETBMAPA:
case XFS_IOC_GETBMAPX:
return xfs_ioc_getbmap(filp, cmd, arg);
case FS_IOC_GETFSMAP:
return xfs_ioc_getfsmap(ip, arg);
case XFS_IOC_SCRUB_METADATA:
return xfs_ioc_scrub_metadata(ip, arg);
case XFS_IOC_FD_TO_HANDLE:
case XFS_IOC_PATH_TO_HANDLE:
case XFS_IOC_PATH_TO_FSHANDLE: {
xfs_fsop_handlereq_t hreq;
if (copy_from_user(&hreq, arg, sizeof(hreq)))
return -EFAULT;
return xfs_find_handle(cmd, &hreq);
}
case XFS_IOC_OPEN_BY_HANDLE: {
xfs_fsop_handlereq_t hreq;
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -EFAULT;
return xfs_open_by_handle(filp, &hreq);
}
case XFS_IOC_READLINK_BY_HANDLE: {
xfs_fsop_handlereq_t hreq;
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -EFAULT;
return xfs_readlink_by_handle(filp, &hreq);
}
case XFS_IOC_ATTRLIST_BY_HANDLE:
return xfs_attrlist_by_handle(filp, arg);
case XFS_IOC_ATTRMULTI_BY_HANDLE:
return xfs_attrmulti_by_handle(filp, arg);
case XFS_IOC_SWAPEXT: {
struct xfs_swapext sxp;
if (copy_from_user(&sxp, arg, sizeof(xfs_swapext_t)))
return -EFAULT;
error = mnt_want_write_file(filp);
if (error)
return error;
error = xfs_ioc_swapext(&sxp);
mnt_drop_write_file(filp);
return error;
}
case XFS_IOC_FSCOUNTS: {
xfs_fsop_counts_t out;
xfs_fs_counts(mp, &out);
if (copy_to_user(arg, &out, sizeof(out)))
return -EFAULT;
return 0;
}
case XFS_IOC_SET_RESBLKS: {
xfs_fsop_resblks_t inout;
uint64_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (mp->m_flags & XFS_MOUNT_RDONLY)
return -EROFS;
if (copy_from_user(&inout, arg, sizeof(inout)))
return -EFAULT;
error = mnt_want_write_file(filp);
if (error)
return error;
/* input parameter is passed in resblks field of structure */
in = inout.resblks;
error = xfs_reserve_blocks(mp, &in, &inout);
mnt_drop_write_file(filp);
if (error)
return error;
if (copy_to_user(arg, &inout, sizeof(inout)))
return -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 -EFAULT;
return 0;
}
case XFS_IOC_FSGROWFSDATA: {
xfs_growfs_data_t in;
if (copy_from_user(&in, arg, sizeof(in)))
return -EFAULT;
error = mnt_want_write_file(filp);
if (error)
return error;
error = xfs_growfs_data(mp, &in);
mnt_drop_write_file(filp);
return error;
}
case XFS_IOC_FSGROWFSLOG: {
xfs_growfs_log_t in;
if (copy_from_user(&in, arg, sizeof(in)))
return -EFAULT;
error = mnt_want_write_file(filp);
if (error)
return error;
error = xfs_growfs_log(mp, &in);
mnt_drop_write_file(filp);
return error;
}
case XFS_IOC_FSGROWFSRT: {
xfs_growfs_rt_t in;
if (copy_from_user(&in, arg, sizeof(in)))
return -EFAULT;
error = mnt_want_write_file(filp);
if (error)
return error;
error = xfs_growfs_rt(mp, &in);
mnt_drop_write_file(filp);
return error;
}
case XFS_IOC_GOINGDOWN: {
uint32_t in;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (get_user(in, (uint32_t __user *)arg))
return -EFAULT;
return xfs_fs_goingdown(mp, in);
}
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 -EFAULT;
return xfs_errortag_add(mp, in.errtag);
}
case XFS_IOC_ERROR_CLEARALL:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
return xfs_errortag_clearall(mp);
case XFS_IOC_FREE_EOFBLOCKS: {
struct xfs_fs_eofblocks eofb;
struct xfs_eofblocks keofb;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (mp->m_flags & XFS_MOUNT_RDONLY)
return -EROFS;
if (copy_from_user(&eofb, arg, sizeof(eofb)))
return -EFAULT;
error = xfs_fs_eofblocks_from_user(&eofb, &keofb);
if (error)
return error;
sb_start_write(mp->m_super);
error = xfs_icache_free_eofblocks(mp, &keofb);
sb_end_write(mp->m_super);
return error;
}
default:
return -ENOTTY;
}
}
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