// 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>
#include <linux/fileattr.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_mnt_user_ns(filp), 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(
        struct file             *file,
        unsigned int            cmd,
        void                    __user *arg)
{
        struct xfs_mount        *mp = XFS_I(file_inode(file))->i_mount;
        struct xfs_fsop_bulkreq bulkreq;
        struct xfs_ibulk        breq = {
                .mp             = mp,
                .mnt_userns     = file_mnt_user_ns(file),
                .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 file                     *file,
        unsigned int                    cmd,
        struct xfs_bulkstat_req __user  *arg)
{
        struct xfs_mount                *mp = XFS_I(file_inode(file))->i_mount;
        struct xfs_bulk_ireq            hdr;
        struct xfs_ibulk                breq = {
                .mp                     = mp,
                .mnt_userns             = file_mnt_user_ns(file),
        };
        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 void
xfs_fill_fsxattr(
        struct xfs_inode        *ip,
        int                     whichfork,
        struct fileattr         *fa)
{
        struct xfs_mount        *mp = ip->i_mount;
        struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);

        fileattr_fill_xflags(fa, xfs_ip2xflags(ip));

        fa->fsx_extsize = XFS_FSB_TO_B(mp, ip->i_extsize);
        if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE)
                fa->fsx_cowextsize = XFS_FSB_TO_B(mp, ip->i_cowextsize);
        fa->fsx_projid = ip->i_projid;
        if (ifp && !xfs_need_iread_extents(ifp))
                fa->fsx_nextents = xfs_iext_count(ifp);
        else
                fa->fsx_nextents = xfs_ifork_nextents(ifp);
}

STATIC int
xfs_ioc_fsgetxattra(
        xfs_inode_t             *ip,
        void                    __user *arg)
{
        struct fileattr         fa;

        xfs_ilock(ip, XFS_ILOCK_SHARED);
        xfs_fill_fsxattr(ip, XFS_ATTR_FORK, &fa);
        xfs_iunlock(ip, XFS_ILOCK_SHARED);

        return copy_fsxattr_to_user(&fa, arg);
}

int
xfs_fileattr_get(
        struct dentry           *dentry,
        struct fileattr         *fa)
{
        struct xfs_inode        *ip = XFS_I(d_inode(dentry));

        if (d_is_special(dentry))
                return -ENOTTY;

        xfs_ilock(ip, XFS_ILOCK_SHARED);
        xfs_fill_fsxattr(ip, XFS_DATA_FORK, fa);
        xfs_iunlock(ip, XFS_ILOCK_SHARED);

        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_diflags & 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_diflags2 & (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 fileattr         *fa)
{
        struct xfs_mount        *mp = ip->i_mount;
        uint64_t                i_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_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_diflags2 &= ~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. */
        i_flags2 = xfs_flags2diflags2(ip, fa->fsx_xflags);
        if (i_flags2 && !xfs_sb_version_has_v3inode(&mp->m_sb))
                return -EINVAL;

        ip->i_diflags = xfs_flags2diflags(ip, fa->fsx_xflags);
        ip->i_diflags2 = i_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 fileattr         *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_diflags2 & XFS_DIFLAG2_DAX)) ||
            (!(fa->fsx_xflags & FS_XFLAG_DAX) &&
             (ip->i_diflags2 & 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_dquot        *pdqp)
{
        struct xfs_mount        *mp = ip->i_mount;
        struct xfs_trans        *tp;
        int                     error = -EROFS;

        if (mp->m_flags & XFS_MOUNT_RDONLY)
                goto out_error;
        error = -EIO;
        if (XFS_FORCED_SHUTDOWN(mp))
                goto out_error;

        error = xfs_trans_alloc_ichange(ip, NULL, NULL, pdqp,
                        capable(CAP_FOWNER), &tp);
        if (error)
                goto out_error;

        if (mp->m_flags & XFS_MOUNT_WSYNC)
                xfs_trans_set_sync(tp);

        return tp;

out_error:
        return ERR_PTR(error);
}

/*
 * Validate a proposed extent size hint.  For regular files, the hint can only
 * be changed if no extents are allocated.
 */
static int
xfs_ioctl_setattr_check_extsize(
        struct xfs_inode        *ip,
        struct fileattr         *fa)
{
        struct xfs_mount        *mp = ip->i_mount;
        xfs_failaddr_t          failaddr;
        uint16_t                new_diflags;

        if (!fa->fsx_valid)
                return 0;

        if (S_ISREG(VFS_I(ip)->i_mode) && ip->i_df.if_nextents &&
            XFS_FSB_TO_B(mp, ip->i_extsize) != fa->fsx_extsize)
                return -EINVAL;

        if (fa->fsx_extsize & mp->m_blockmask)
                return -EINVAL;

        new_diflags = xfs_flags2diflags(ip, fa->fsx_xflags);

        /*
         * Inode verifiers on older kernels don't check that the extent size
         * hint is an integer multiple of the rt extent size on a directory
         * with both rtinherit and extszinherit flags set.  Don't let sysadmins
         * misconfigure directories.
         */
        if ((new_diflags & XFS_DIFLAG_RTINHERIT) &&
            (new_diflags & XFS_DIFLAG_EXTSZINHERIT)) {
                unsigned int    rtextsize_bytes;

                rtextsize_bytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize);
                if (fa->fsx_extsize % rtextsize_bytes)
                        return -EINVAL;
        }

        failaddr = xfs_inode_validate_extsize(ip->i_mount,
                        XFS_B_TO_FSB(mp, fa->fsx_extsize),
                        VFS_I(ip)->i_mode, new_diflags);
        return failaddr != NULL ? -EINVAL : 0;
}

static int
xfs_ioctl_setattr_check_cowextsize(
        struct xfs_inode        *ip,
        struct fileattr         *fa)
{
        struct xfs_mount        *mp = ip->i_mount;
        xfs_failaddr_t          failaddr;
        uint64_t                new_diflags2;
        uint16_t                new_diflags;

        if (!fa->fsx_valid)
                return 0;

        if (fa->fsx_cowextsize & mp->m_blockmask)
                return -EINVAL;

        new_diflags = xfs_flags2diflags(ip, fa->fsx_xflags);
        new_diflags2 = xfs_flags2diflags2(ip, fa->fsx_xflags);

        failaddr = xfs_inode_validate_cowextsize(ip->i_mount,
                        XFS_B_TO_FSB(mp, fa->fsx_cowextsize),
                        VFS_I(ip)->i_mode, new_diflags, new_diflags2);
        return failaddr != NULL ? -EINVAL : 0;
}

static int
xfs_ioctl_setattr_check_projid(
        struct xfs_inode        *ip,
        struct fileattr         *fa)
{
        if (!fa->fsx_valid)
                return 0;

        /* 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;
}

int
xfs_fileattr_set(
        struct user_namespace   *mnt_userns,
        struct dentry           *dentry,
        struct fileattr         *fa)
{
        struct xfs_inode        *ip = XFS_I(d_inode(dentry));
        struct xfs_mount        *mp = ip->i_mount;
        struct xfs_trans        *tp;
        struct xfs_dquot        *pdqp = NULL;
        struct xfs_dquot        *olddquot = NULL;
        int                     error;

        trace_xfs_ioctl_setattr(ip);

        if (d_is_special(dentry))
                return -ENOTTY;

        if (!fa->fsx_valid) {
                if (fa->flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL |
                                  FS_NOATIME_FL | FS_NODUMP_FL |
                                  FS_SYNC_FL | FS_DAX_FL | FS_PROJINHERIT_FL))
                        return -EOPNOTSUPP;
        }

        error = xfs_ioctl_setattr_check_projid(ip, fa);
        if (error)
                return error;

        /*
         * 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 (fa->fsx_valid && XFS_IS_QUOTA_ON(mp)) {
                error = 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 (error)
                        return error;
        }

        xfs_ioctl_setattr_prepare_dax(ip, fa);

        tp = xfs_ioctl_setattr_get_trans(ip, pdqp);
        if (IS_ERR(tp)) {
                error = PTR_ERR(tp);
                goto error_free_dquots;
        }

        error = xfs_ioctl_setattr_check_extsize(ip, fa);
        if (error)
                goto error_trans_cancel;

        error = xfs_ioctl_setattr_check_cowextsize(ip, fa);
        if (error)
                goto error_trans_cancel;

        error = xfs_ioctl_setattr_xflags(tp, ip, fa);
        if (error)
                goto error_trans_cancel;

        if (!fa->fsx_valid)
                goto skip_xattr;
        /*
         * 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(mnt_userns, 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_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_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_diflags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT))
                ip->i_extsize = XFS_B_TO_FSB(mp, fa->fsx_extsize);
        else
                ip->i_extsize = 0;

        if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
                if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE)
                        ip->i_cowextsize = XFS_B_TO_FSB(mp, fa->fsx_cowextsize);
                else
                        ip->i_cowextsize = 0;
        }

skip_xattr:
        error = xfs_trans_commit(tp);

        /*
         * Release any dquot(s) the inode had kept before chown.
         */
        xfs_qm_dqrele(olddquot);
        xfs_qm_dqrele(pdqp);

        return error;

error_trans_cancel:
        xfs_trans_cancel(tp);
error_free_dquots:
        xfs_qm_dqrele(pdqp);
        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:
                /* 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 file                     *file,
        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(file, &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(filp, cmd, arg);

        case XFS_IOC_BULKSTAT:
                return xfs_ioc_bulkstat(filp, 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_FSGETXATTRA:
                return xfs_ioc_fsgetxattra(ip, 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(filp, 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: {
                struct xfs_growfs_data 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: {
                struct xfs_growfs_log 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;

                trace_xfs_ioc_free_eofblocks(mp, &keofb, _RET_IP_);

                sb_start_write(mp->m_super);
                error = xfs_blockgc_free_space(mp, &keofb);
                sb_end_write(mp->m_super);
                return error;
        }

        default:
                return -ENOTTY;
        }
}