ioctl.c

Go to the documentation of this file.

#include <linux/in.h>

#include "super.h"
#include "mds_client.h"
#include <linux/ceph/ceph_debug.h>

#include "ioctl.h"


/*
 * ioctls
 */

/*
 * get and set the file layout
 */
static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
{
    struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
    struct ceph_ioctl_layout l;
    int err;

    err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
    if (!err) {
        l.stripe_unit = ceph_file_layout_su(ci->i_layout);
        l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
        l.object_size = ceph_file_layout_object_size(ci->i_layout);
        l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
        l.preferred_osd = (s32)-1;
        if (copy_to_user(arg, &l, sizeof(l)))
            return -EFAULT;
    }

    return err;
}

static long __validate_layout(struct ceph_mds_client *mdsc,
                  struct ceph_ioctl_layout *l)
{
    int i, err;

    /* validate striping parameters */
    if ((l->object_size & ~PAGE_MASK) ||
        (l->stripe_unit & ~PAGE_MASK) ||
        (l->stripe_unit != 0 &&
         ((unsigned)l->object_size % (unsigned)l->stripe_unit)))
        return -EINVAL;

    /* make sure it's a valid data pool */
    mutex_lock(&mdsc->mutex);
    err = -EINVAL;
    for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
        if (mdsc->mdsmap->m_data_pg_pools[i] == l->data_pool) {
            err = 0;
            break;
        }
    mutex_unlock(&mdsc->mutex);
    if (err)
        return err;

    return 0;
}

static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
{
    struct inode *inode = file->f_dentry->d_inode;
    struct inode *parent_inode;
    struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
    struct ceph_mds_request *req;
    struct ceph_ioctl_layout l;
    struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
    struct ceph_ioctl_layout nl;
    int err;

    if (copy_from_user(&l, arg, sizeof(l)))
        return -EFAULT;

    /* validate changed params against current layout */
    err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
    if (err)
        return err;

    memset(&nl, 0, sizeof(nl));
    if (l.stripe_count)
        nl.stripe_count = l.stripe_count;
    else
        nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
    if (l.stripe_unit)
        nl.stripe_unit = l.stripe_unit;
    else
        nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
    if (l.object_size)
        nl.object_size = l.object_size;
    else
        nl.object_size = ceph_file_layout_object_size(ci->i_layout);
    if (l.data_pool)
        nl.data_pool = l.data_pool;
    else
        nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout);

    /* this is obsolete, and always -1 */
    nl.preferred_osd = le64_to_cpu(-1);

    err = __validate_layout(mdsc, &nl);
    if (err)
        return err;

    req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
                       USE_AUTH_MDS);
    if (IS_ERR(req))
        return PTR_ERR(req);
    req->r_inode = inode;
    ihold(inode);
    req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;

    req->r_args.setlayout.layout.fl_stripe_unit =
        cpu_to_le32(l.stripe_unit);
    req->r_args.setlayout.layout.fl_stripe_count =
        cpu_to_le32(l.stripe_count);
    req->r_args.setlayout.layout.fl_object_size =
        cpu_to_le32(l.object_size);
    req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);

    parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
    err = ceph_mdsc_do_request(mdsc, parent_inode, req);
    iput(parent_inode);
    ceph_mdsc_put_request(req);
    return err;
}

/*
 * Set a layout policy on a directory inode. All items in the tree
 * rooted at this inode will inherit this layout on creation,
 * (It doesn't apply retroactively )
 * unless a subdirectory has its own layout policy.
 */
static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
{
    struct inode *inode = file->f_dentry->d_inode;
    struct ceph_mds_request *req;
    struct ceph_ioctl_layout l;
    int err;
    struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;

    /* copy and validate */
    if (copy_from_user(&l, arg, sizeof(l)))
        return -EFAULT;

    err = __validate_layout(mdsc, &l);
    if (err)
        return err;

    req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
                       USE_AUTH_MDS);

    if (IS_ERR(req))
        return PTR_ERR(req);
    req->r_inode = inode;
    ihold(inode);

    req->r_args.setlayout.layout.fl_stripe_unit =
            cpu_to_le32(l.stripe_unit);
    req->r_args.setlayout.layout.fl_stripe_count =
            cpu_to_le32(l.stripe_count);
    req->r_args.setlayout.layout.fl_object_size =
            cpu_to_le32(l.object_size);
    req->r_args.setlayout.layout.fl_pg_pool =
            cpu_to_le32(l.data_pool);

    err = ceph_mdsc_do_request(mdsc, inode, req);
    ceph_mdsc_put_request(req);
    return err;
}

/*
 * Return object name, size/offset information, and location (OSD
 * number, network address) for a given file offset.
 */
static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
{
    struct ceph_ioctl_dataloc dl;
    struct inode *inode = file->f_dentry->d_inode;
    struct ceph_inode_info *ci = ceph_inode(inode);
    struct ceph_osd_client *osdc =
        &ceph_sb_to_client(inode->i_sb)->client->osdc;
    u64 len = 1, olen;
    u64 tmp;
    struct ceph_object_layout ol;
    struct ceph_pg pgid;
    int r;

    /* copy and validate */
    if (copy_from_user(&dl, arg, sizeof(dl)))
        return -EFAULT;

    down_read(&osdc->map_sem);
    r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
                      &dl.object_no, &dl.object_offset,
                      &olen);
    if (r < 0)
        return -EIO;
    dl.file_offset -= dl.object_offset;
    dl.object_size = ceph_file_layout_object_size(ci->i_layout);
    dl.block_size = ceph_file_layout_su(ci->i_layout);

    /* block_offset = object_offset % block_size */
    tmp = dl.object_offset;
    dl.block_offset = do_div(tmp, dl.block_size);

    snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
         ceph_ino(inode), dl.object_no);
    ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
                osdc->osdmap);

    pgid = ol.ol_pgid;
    dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
    if (dl.osd >= 0) {
        struct ceph_entity_addr *a =
            ceph_osd_addr(osdc->osdmap, dl.osd);
        if (a)
            memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
    } else {
        memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
    }
    up_read(&osdc->map_sem);

    /* send result back to user */
    if (copy_to_user(arg, &dl, sizeof(dl)))
        return -EFAULT;

    return 0;
}

static long ceph_ioctl_lazyio(struct file *file)
{
    struct ceph_file_info *fi = file->private_data;
    struct inode *inode = file->f_dentry->d_inode;
    struct ceph_inode_info *ci = ceph_inode(inode);

    if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
        spin_lock(&ci->i_ceph_lock);
        ci->i_nr_by_mode[fi->fmode]--;
        fi->fmode |= CEPH_FILE_MODE_LAZY;
        ci->i_nr_by_mode[fi->fmode]++;
        spin_unlock(&ci->i_ceph_lock);
        dout("ioctl_layzio: file %p marked lazy\n", file);

        ceph_check_caps(ci, 0, NULL);
    } else {
        dout("ioctl_layzio: file %p already lazy\n", file);
    }
    return 0;
}

static long ceph_ioctl_syncio(struct file *file)
{
    struct ceph_file_info *fi = file->private_data;

    fi->flags |= CEPH_F_SYNC;
    return 0;
}

long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
    switch (cmd) {
    case CEPH_IOC_GET_LAYOUT:
        return ceph_ioctl_get_layout(file, (void __user *)arg);

    case CEPH_IOC_SET_LAYOUT:
        return ceph_ioctl_set_layout(file, (void __user *)arg);

    case CEPH_IOC_SET_LAYOUT_POLICY:
        return ceph_ioctl_set_layout_policy(file, (void __user *)arg);

    case CEPH_IOC_GET_DATALOC:
        return ceph_ioctl_get_dataloc(file, (void __user *)arg);

    case CEPH_IOC_LAZYIO:
        return ceph_ioctl_lazyio(file);

    case CEPH_IOC_SYNCIO:
        return ceph_ioctl_syncio(file);
    }

    return -ENOTTY;
}