ioctl.c

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/*
 * linux/fs/ocfs2/ioctl.c
 *
 * Copyright (C) 2006 Herbert Poetzl
 * adapted from Remy Card's ext2/ioctl.c
 */

#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/compat.h>

#include <cluster/masklog.h>

#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
#include "journal.h"

#include "ocfs2_fs.h"
#include "ioctl.h"
#include "resize.h"
#include "refcounttree.h"
#include "sysfile.h"
#include "dir.h"
#include "buffer_head_io.h"
#include "suballoc.h"
#include "move_extents.h"

#define o2info_from_user(a, b)  \
        copy_from_user(&(a), (b), sizeof(a))
#define o2info_to_user(a, b)    \
        copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))

/*
 * This call is void because we are already reporting an error that may
 * be -EFAULT.  The error will be returned from the ioctl(2) call.  It's
 * just a best-effort to tell userspace that this request caused the error.
 */
static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
                    struct ocfs2_info_request __user *req)
{
    kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
    (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
}

static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
{
    req->ir_flags |= OCFS2_INFO_FL_FILLED;
}

static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
{
    req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
}

static inline int o2info_coherent(struct ocfs2_info_request *req)
{
    return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
}

static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
{
    int status;

    status = ocfs2_inode_lock(inode, NULL, 0);
    if (status < 0) {
        mlog_errno(status);
        return status;
    }
    ocfs2_get_inode_flags(OCFS2_I(inode));
    *flags = OCFS2_I(inode)->ip_attr;
    ocfs2_inode_unlock(inode, 0);

    return status;
}

static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
                unsigned mask)
{
    struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
    handle_t *handle = NULL;
    struct buffer_head *bh = NULL;
    unsigned oldflags;
    int status;

    mutex_lock(&inode->i_mutex);

    status = ocfs2_inode_lock(inode, &bh, 1);
    if (status < 0) {
        mlog_errno(status);
        goto bail;
    }

    status = -EACCES;
    if (!inode_owner_or_capable(inode))
        goto bail_unlock;

    if (!S_ISDIR(inode->i_mode))
        flags &= ~OCFS2_DIRSYNC_FL;

    handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
    if (IS_ERR(handle)) {
        status = PTR_ERR(handle);
        mlog_errno(status);
        goto bail_unlock;
    }

    oldflags = ocfs2_inode->ip_attr;
    flags = flags & mask;
    flags |= oldflags & ~mask;

    /*
     * The IMMUTABLE and APPEND_ONLY flags can only be changed by
     * the relevant capability.
     */
    status = -EPERM;
    if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
        (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
        if (!capable(CAP_LINUX_IMMUTABLE))
            goto bail_commit;
    }

    ocfs2_inode->ip_attr = flags;
    ocfs2_set_inode_flags(inode);

    status = ocfs2_mark_inode_dirty(handle, inode, bh);
    if (status < 0)
        mlog_errno(status);

bail_commit:
    ocfs2_commit_trans(osb, handle);
bail_unlock:
    ocfs2_inode_unlock(inode, 1);
bail:
    mutex_unlock(&inode->i_mutex);

    brelse(bh);

    return status;
}

int ocfs2_info_handle_blocksize(struct inode *inode,
                struct ocfs2_info_request __user *req)
{
    int status = -EFAULT;
    struct ocfs2_info_blocksize oib;

    if (o2info_from_user(oib, req))
        goto bail;

    oib.ib_blocksize = inode->i_sb->s_blocksize;

    o2info_set_request_filled(&oib.ib_req);

    if (o2info_to_user(oib, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oib.ib_req, req);

    return status;
}

int ocfs2_info_handle_clustersize(struct inode *inode,
                  struct ocfs2_info_request __user *req)
{
    int status = -EFAULT;
    struct ocfs2_info_clustersize oic;
    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

    if (o2info_from_user(oic, req))
        goto bail;

    oic.ic_clustersize = osb->s_clustersize;

    o2info_set_request_filled(&oic.ic_req);

    if (o2info_to_user(oic, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oic.ic_req, req);

    return status;
}

int ocfs2_info_handle_maxslots(struct inode *inode,
                   struct ocfs2_info_request __user *req)
{
    int status = -EFAULT;
    struct ocfs2_info_maxslots oim;
    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

    if (o2info_from_user(oim, req))
        goto bail;

    oim.im_max_slots = osb->max_slots;

    o2info_set_request_filled(&oim.im_req);

    if (o2info_to_user(oim, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oim.im_req, req);

    return status;
}

int ocfs2_info_handle_label(struct inode *inode,
                struct ocfs2_info_request __user *req)
{
    int status = -EFAULT;
    struct ocfs2_info_label oil;
    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

    if (o2info_from_user(oil, req))
        goto bail;

    memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);

    o2info_set_request_filled(&oil.il_req);

    if (o2info_to_user(oil, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oil.il_req, req);

    return status;
}

int ocfs2_info_handle_uuid(struct inode *inode,
               struct ocfs2_info_request __user *req)
{
    int status = -EFAULT;
    struct ocfs2_info_uuid oiu;
    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

    if (o2info_from_user(oiu, req))
        goto bail;

    memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);

    o2info_set_request_filled(&oiu.iu_req);

    if (o2info_to_user(oiu, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oiu.iu_req, req);

    return status;
}

int ocfs2_info_handle_fs_features(struct inode *inode,
                  struct ocfs2_info_request __user *req)
{
    int status = -EFAULT;
    struct ocfs2_info_fs_features oif;
    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

    if (o2info_from_user(oif, req))
        goto bail;

    oif.if_compat_features = osb->s_feature_compat;
    oif.if_incompat_features = osb->s_feature_incompat;
    oif.if_ro_compat_features = osb->s_feature_ro_compat;

    o2info_set_request_filled(&oif.if_req);

    if (o2info_to_user(oif, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oif.if_req, req);

    return status;
}

int ocfs2_info_handle_journal_size(struct inode *inode,
                   struct ocfs2_info_request __user *req)
{
    int status = -EFAULT;
    struct ocfs2_info_journal_size oij;
    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

    if (o2info_from_user(oij, req))
        goto bail;

    oij.ij_journal_size = osb->journal->j_inode->i_size;

    o2info_set_request_filled(&oij.ij_req);

    if (o2info_to_user(oij, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oij.ij_req, req);

    return status;
}

int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
                struct inode *inode_alloc, u64 blkno,
                struct ocfs2_info_freeinode *fi, u32 slot)
{
    int status = 0, unlock = 0;

    struct buffer_head *bh = NULL;
    struct ocfs2_dinode *dinode_alloc = NULL;

    if (inode_alloc)
        mutex_lock(&inode_alloc->i_mutex);

    if (o2info_coherent(&fi->ifi_req)) {
        status = ocfs2_inode_lock(inode_alloc, &bh, 0);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
        unlock = 1;
    } else {
        status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
    }

    dinode_alloc = (struct ocfs2_dinode *)bh->b_data;

    fi->ifi_stat[slot].lfi_total =
        le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
    fi->ifi_stat[slot].lfi_free =
        le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
        le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);

bail:
    if (unlock)
        ocfs2_inode_unlock(inode_alloc, 0);

    if (inode_alloc)
        mutex_unlock(&inode_alloc->i_mutex);

    brelse(bh);

    return status;
}

int ocfs2_info_handle_freeinode(struct inode *inode,
                struct ocfs2_info_request __user *req)
{
    u32 i;
    u64 blkno = -1;
    char namebuf[40];
    int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;
    struct ocfs2_info_freeinode *oifi = NULL;
    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
    struct inode *inode_alloc = NULL;

    oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
    if (!oifi) {
        status = -ENOMEM;
        mlog_errno(status);
        goto out_err;
    }

    if (o2info_from_user(*oifi, req))
        goto bail;

    oifi->ifi_slotnum = osb->max_slots;

    for (i = 0; i < oifi->ifi_slotnum; i++) {
        if (o2info_coherent(&oifi->ifi_req)) {
            inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
            if (!inode_alloc) {
                mlog(ML_ERROR, "unable to get alloc inode in "
                    "slot %u\n", i);
                status = -EIO;
                goto bail;
            }
        } else {
            ocfs2_sprintf_system_inode_name(namebuf,
                            sizeof(namebuf),
                            type, i);
            status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
                                namebuf,
                                strlen(namebuf),
                                &blkno);
            if (status < 0) {
                status = -ENOENT;
                goto bail;
            }
        }

        status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
        if (status < 0)
            goto bail;

        iput(inode_alloc);
        inode_alloc = NULL;
    }

    o2info_set_request_filled(&oifi->ifi_req);

    if (o2info_to_user(*oifi, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oifi->ifi_req, req);

    kfree(oifi);
out_err:
    return status;
}

static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
                   unsigned int chunksize)
{
    int index;

    index = __ilog2_u32(chunksize);
    if (index >= OCFS2_INFO_MAX_HIST)
        index = OCFS2_INFO_MAX_HIST - 1;

    hist->fc_chunks[index]++;
    hist->fc_clusters[index] += chunksize;
}

static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
                   unsigned int chunksize)
{
    if (chunksize > stats->ffs_max)
        stats->ffs_max = chunksize;

    if (chunksize < stats->ffs_min)
        stats->ffs_min = chunksize;

    stats->ffs_avg += chunksize;
    stats->ffs_free_chunks_real++;
}

void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
               unsigned int chunksize)
{
    o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
    o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
}

int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
                   struct inode *gb_inode,
                   struct ocfs2_dinode *gb_dinode,
                   struct ocfs2_chain_rec *rec,
                   struct ocfs2_info_freefrag *ffg,
                   u32 chunks_in_group)
{
    int status = 0, used;
    u64 blkno;

    struct buffer_head *bh = NULL;
    struct ocfs2_group_desc *bg = NULL;

    unsigned int max_bits, num_clusters;
    unsigned int offset = 0, cluster, chunk;
    unsigned int chunk_free, last_chunksize = 0;

    if (!le32_to_cpu(rec->c_free))
        goto bail;

    do {
        if (!bg)
            blkno = le64_to_cpu(rec->c_blkno);
        else
            blkno = le64_to_cpu(bg->bg_next_group);

        if (bh) {
            brelse(bh);
            bh = NULL;
        }

        if (o2info_coherent(&ffg->iff_req))
            status = ocfs2_read_group_descriptor(gb_inode,
                                 gb_dinode,
                                 blkno, &bh);
        else
            status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);

        if (status < 0) {
            mlog(ML_ERROR, "Can't read the group descriptor # "
                 "%llu from device.", (unsigned long long)blkno);
            status = -EIO;
            goto bail;
        }

        bg = (struct ocfs2_group_desc *)bh->b_data;

        if (!le16_to_cpu(bg->bg_free_bits_count))
            continue;

        max_bits = le16_to_cpu(bg->bg_bits);
        offset = 0;

        for (chunk = 0; chunk < chunks_in_group; chunk++) {
            /*
             * last chunk may be not an entire one.
             */
            if ((offset + ffg->iff_chunksize) > max_bits)
                num_clusters = max_bits - offset;
            else
                num_clusters = ffg->iff_chunksize;

            chunk_free = 0;
            for (cluster = 0; cluster < num_clusters; cluster++) {
                used = ocfs2_test_bit(offset,
                        (unsigned long *)bg->bg_bitmap);
                /*
                 * - chunk_free counts free clusters in #N chunk.
                 * - last_chunksize records the size(in) clusters
                 *   for the last real free chunk being counted.
                 */
                if (!used) {
                    last_chunksize++;
                    chunk_free++;
                }

                if (used && last_chunksize) {
                    ocfs2_info_update_ffg(ffg,
                                  last_chunksize);
                    last_chunksize = 0;
                }

                offset++;
            }

            if (chunk_free == ffg->iff_chunksize)
                ffg->iff_ffs.ffs_free_chunks++;
        }

        /*
         * need to update the info for last free chunk.
         */
        if (last_chunksize)
            ocfs2_info_update_ffg(ffg, last_chunksize);

    } while (le64_to_cpu(bg->bg_next_group));

bail:
    brelse(bh);

    return status;
}

int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
                    struct inode *gb_inode, u64 blkno,
                    struct ocfs2_info_freefrag *ffg)
{
    u32 chunks_in_group;
    int status = 0, unlock = 0, i;

    struct buffer_head *bh = NULL;
    struct ocfs2_chain_list *cl = NULL;
    struct ocfs2_chain_rec *rec = NULL;
    struct ocfs2_dinode *gb_dinode = NULL;

    if (gb_inode)
        mutex_lock(&gb_inode->i_mutex);

    if (o2info_coherent(&ffg->iff_req)) {
        status = ocfs2_inode_lock(gb_inode, &bh, 0);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
        unlock = 1;
    } else {
        status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
    }

    gb_dinode = (struct ocfs2_dinode *)bh->b_data;
    cl = &(gb_dinode->id2.i_chain);

    /*
     * Chunksize(in) clusters from userspace should be
     * less than clusters in a group.
     */
    if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
        status = -EINVAL;
        goto bail;
    }

    memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));

    ffg->iff_ffs.ffs_min = ~0U;
    ffg->iff_ffs.ffs_clusters =
            le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
    ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
            le32_to_cpu(gb_dinode->id1.bitmap1.i_used);

    chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;

    for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
        rec = &(cl->cl_recs[i]);
        status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
                            gb_dinode,
                            rec, ffg,
                            chunks_in_group);
        if (status)
            goto bail;
    }

    if (ffg->iff_ffs.ffs_free_chunks_real)
        ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
                    ffg->iff_ffs.ffs_free_chunks_real);
bail:
    if (unlock)
        ocfs2_inode_unlock(gb_inode, 0);

    if (gb_inode)
        mutex_unlock(&gb_inode->i_mutex);

    if (gb_inode)
        iput(gb_inode);

    brelse(bh);

    return status;
}

int ocfs2_info_handle_freefrag(struct inode *inode,
                   struct ocfs2_info_request __user *req)
{
    u64 blkno = -1;
    char namebuf[40];
    int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;

    struct ocfs2_info_freefrag *oiff;
    struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
    struct inode *gb_inode = NULL;

    oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
    if (!oiff) {
        status = -ENOMEM;
        mlog_errno(status);
        goto out_err;
    }

    if (o2info_from_user(*oiff, req))
        goto bail;
    /*
     * chunksize from userspace should be power of 2.
     */
    if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
        (!oiff->iff_chunksize)) {
        status = -EINVAL;
        goto bail;
    }

    if (o2info_coherent(&oiff->iff_req)) {
        gb_inode = ocfs2_get_system_file_inode(osb, type,
                               OCFS2_INVALID_SLOT);
        if (!gb_inode) {
            mlog(ML_ERROR, "unable to get global_bitmap inode\n");
            status = -EIO;
            goto bail;
        }
    } else {
        ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
                        OCFS2_INVALID_SLOT);
        status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
                            namebuf,
                            strlen(namebuf),
                            &blkno);
        if (status < 0) {
            status = -ENOENT;
            goto bail;
        }
    }

    status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
    if (status < 0)
        goto bail;

    o2info_set_request_filled(&oiff->iff_req);

    if (o2info_to_user(*oiff, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oiff->iff_req, req);

    kfree(oiff);
out_err:
    return status;
}

int ocfs2_info_handle_unknown(struct inode *inode,
                  struct ocfs2_info_request __user *req)
{
    int status = -EFAULT;
    struct ocfs2_info_request oir;

    if (o2info_from_user(oir, req))
        goto bail;

    o2info_clear_request_filled(&oir);

    if (o2info_to_user(oir, req))
        goto bail;

    status = 0;
bail:
    if (status)
        o2info_set_request_error(&oir, req);

    return status;
}

/*
 * Validate and distinguish OCFS2_IOC_INFO requests.
 *
 * - validate the magic number.
 * - distinguish different requests.
 * - validate size of different requests.
 */
int ocfs2_info_handle_request(struct inode *inode,
                  struct ocfs2_info_request __user *req)
{
    int status = -EFAULT;
    struct ocfs2_info_request oir;

    if (o2info_from_user(oir, req))
        goto bail;

    status = -EINVAL;
    if (oir.ir_magic != OCFS2_INFO_MAGIC)
        goto bail;

    switch (oir.ir_code) {
    case OCFS2_INFO_BLOCKSIZE:
        if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
            status = ocfs2_info_handle_blocksize(inode, req);
        break;
    case OCFS2_INFO_CLUSTERSIZE:
        if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
            status = ocfs2_info_handle_clustersize(inode, req);
        break;
    case OCFS2_INFO_MAXSLOTS:
        if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
            status = ocfs2_info_handle_maxslots(inode, req);
        break;
    case OCFS2_INFO_LABEL:
        if (oir.ir_size == sizeof(struct ocfs2_info_label))
            status = ocfs2_info_handle_label(inode, req);
        break;
    case OCFS2_INFO_UUID:
        if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
            status = ocfs2_info_handle_uuid(inode, req);
        break;
    case OCFS2_INFO_FS_FEATURES:
        if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
            status = ocfs2_info_handle_fs_features(inode, req);
        break;
    case OCFS2_INFO_JOURNAL_SIZE:
        if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
            status = ocfs2_info_handle_journal_size(inode, req);
        break;
    case OCFS2_INFO_FREEINODE:
        if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
            status = ocfs2_info_handle_freeinode(inode, req);
        break;
    case OCFS2_INFO_FREEFRAG:
        if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
            status = ocfs2_info_handle_freefrag(inode, req);
        break;
    default:
        status = ocfs2_info_handle_unknown(inode, req);
        break;
    }

bail:
    return status;
}

int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
              u64 *req_addr, int compat_flag)
{
    int status = -EFAULT;
    u64 __user *bp = NULL;

    if (compat_flag) {
#ifdef CONFIG_COMPAT
        /*
         * pointer bp stores the base address of a pointers array,
         * which collects all addresses of separate request.
         */
        bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
#else
        BUG();
#endif
    } else
        bp = (u64 __user *)(unsigned long)(info->oi_requests);

    if (o2info_from_user(*req_addr, bp + idx))
        goto bail;

    status = 0;
bail:
    return status;
}

/*
 * OCFS2_IOC_INFO handles an array of requests passed from userspace.
 *
 * ocfs2_info_handle() recevies a large info aggregation, grab and
 * validate the request count from header, then break it into small
 * pieces, later specific handlers can handle them one by one.
 *
 * Idea here is to make each separate request small enough to ensure
 * a better backward&forward compatibility, since a small piece of
 * request will be less likely to be broken if disk layout get changed.
 */
int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
              int compat_flag)
{
    int i, status = 0;
    u64 req_addr;
    struct ocfs2_info_request __user *reqp;

    if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
        (!info->oi_requests)) {
        status = -EINVAL;
        goto bail;
    }

    for (i = 0; i < info->oi_count; i++) {

        status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
        if (status)
            break;

        reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
        if (!reqp) {
            status = -EINVAL;
            goto bail;
        }

        status = ocfs2_info_handle_request(inode, reqp);
        if (status)
            break;
    }

bail:
    return status;
}

long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
    struct inode *inode = filp->f_path.dentry->d_inode;
    unsigned int flags;
    int new_clusters;
    int status;
    struct ocfs2_space_resv sr;
    struct ocfs2_new_group_input input;
    struct reflink_arguments args;
    const char __user *old_path;
    const char __user *new_path;
    bool preserve;
    struct ocfs2_info info;
    void __user *argp = (void __user *)arg;

    switch (cmd) {
    case OCFS2_IOC_GETFLAGS:
        status = ocfs2_get_inode_attr(inode, &flags);
        if (status < 0)
            return status;

        flags &= OCFS2_FL_VISIBLE;
        return put_user(flags, (int __user *) arg);
    case OCFS2_IOC_SETFLAGS:
        if (get_user(flags, (int __user *) arg))
            return -EFAULT;

        status = mnt_want_write_file(filp);
        if (status)
            return status;
        status = ocfs2_set_inode_attr(inode, flags,
            OCFS2_FL_MODIFIABLE);
        mnt_drop_write_file(filp);
        return status;
    case OCFS2_IOC_RESVSP:
    case OCFS2_IOC_RESVSP64:
    case OCFS2_IOC_UNRESVSP:
    case OCFS2_IOC_UNRESVSP64:
        if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
            return -EFAULT;

        return ocfs2_change_file_space(filp, cmd, &sr);
    case OCFS2_IOC_GROUP_EXTEND:
        if (!capable(CAP_SYS_RESOURCE))
            return -EPERM;

        if (get_user(new_clusters, (int __user *)arg))
            return -EFAULT;

        status = mnt_want_write_file(filp);
        if (status)
            return status;
        status = ocfs2_group_extend(inode, new_clusters);
        mnt_drop_write_file(filp);
        return status;
    case OCFS2_IOC_GROUP_ADD:
    case OCFS2_IOC_GROUP_ADD64:
        if (!capable(CAP_SYS_RESOURCE))
            return -EPERM;

        if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
            return -EFAULT;

        status = mnt_want_write_file(filp);
        if (status)
            return status;
        status = ocfs2_group_add(inode, &input);
        mnt_drop_write_file(filp);
        return status;
    case OCFS2_IOC_REFLINK:
        if (copy_from_user(&args, argp, sizeof(args)))
            return -EFAULT;
        old_path = (const char __user *)(unsigned long)args.old_path;
        new_path = (const char __user *)(unsigned long)args.new_path;
        preserve = (args.preserve != 0);

        return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
    case OCFS2_IOC_INFO:
        if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
            return -EFAULT;

        return ocfs2_info_handle(inode, &info, 0);
    case FITRIM:
    {
        struct super_block *sb = inode->i_sb;
        struct fstrim_range range;
        int ret = 0;

        if (!capable(CAP_SYS_ADMIN))
            return -EPERM;

        if (copy_from_user(&range, argp, sizeof(range)))
            return -EFAULT;

        ret = ocfs2_trim_fs(sb, &range);
        if (ret < 0)
            return ret;

        if (copy_to_user(argp, &range, sizeof(range)))
            return -EFAULT;

        return 0;
    }
    case OCFS2_IOC_MOVE_EXT:
        return ocfs2_ioctl_move_extents(filp, argp);
    default:
        return -ENOTTY;
    }
}

#ifdef CONFIG_COMPAT
long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
    bool preserve;
    struct reflink_arguments args;
    struct inode *inode = file->f_path.dentry->d_inode;
    struct ocfs2_info info;
    void __user *argp = (void __user *)arg;

    switch (cmd) {
    case OCFS2_IOC32_GETFLAGS:
        cmd = OCFS2_IOC_GETFLAGS;
        break;
    case OCFS2_IOC32_SETFLAGS:
        cmd = OCFS2_IOC_SETFLAGS;
        break;
    case OCFS2_IOC_RESVSP:
    case OCFS2_IOC_RESVSP64:
    case OCFS2_IOC_UNRESVSP:
    case OCFS2_IOC_UNRESVSP64:
    case OCFS2_IOC_GROUP_EXTEND:
    case OCFS2_IOC_GROUP_ADD:
    case OCFS2_IOC_GROUP_ADD64:
    case FITRIM:
        break;
    case OCFS2_IOC_REFLINK:
        if (copy_from_user(&args, argp, sizeof(args)))
            return -EFAULT;
        preserve = (args.preserve != 0);

        return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
                       compat_ptr(args.new_path), preserve);
    case OCFS2_IOC_INFO:
        if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
            return -EFAULT;

        return ocfs2_info_handle(inode, &info, 1);
    case OCFS2_IOC_MOVE_EXT:
        break;
    default:
        return -ENOIOCTLCMD;
    }

    return ocfs2_ioctl(file, cmd, arg);
}
#endif