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   1 #include <linux/in.h>
   2
   3 #include "ioctl.h"
   4 #include "super.h"
   5 #include "ceph_debug.h"
   6
   7
   8 /*
   9  * ioctls
  10  */
  11
  12 /*
  13  * get and set the file layout
  14  */
  15 static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
  16 {
  17         struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
  18         struct ceph_ioctl_layout l;
  19         int err;
  20
  21         err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
  22         if (!err) {
  23                 l.stripe_unit = ceph_file_layout_su(ci->i_layout);
  24                 l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  25                 l.object_size = ceph_file_layout_object_size(ci->i_layout);
  26                 l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
  27                 if (copy_to_user(arg, &l, sizeof(l)))
  28                         return -EFAULT;
  29         }
  30
  31         return err;
  32 }
  33
  34 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
  35 {
  36         struct inode *inode = file->f_dentry->d_inode;
  37         struct inode *parent_inode = file->f_dentry->d_parent->d_inode;
  38         struct ceph_mds_client *mdsc = &ceph_sb_to_client(inode->i_sb)->mdsc;
  39         struct ceph_mds_request *req;
  40         struct ceph_ioctl_layout l;
  41         int err, i;
  42
  43         /* copy and validate */
  44         if (copy_from_user(&l, arg, sizeof(l)))
  45                 return -EFAULT;
  46
  47         if ((l.object_size & ~PAGE_MASK) ||
  48             (l.stripe_unit & ~PAGE_MASK) ||
  49             !l.stripe_unit ||
  50             (l.object_size &&
  51              (unsigned)l.object_size % (unsigned)l.stripe_unit))
  52                 return -EINVAL;
  53
  54         /* make sure it's a valid data pool */
  55         if (l.data_pool > 0) {
  56                 mutex_lock(&mdsc->mutex);
  57                 err = -EINVAL;
  58                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  59                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
  60                                 err = 0;
  61                                 break;
  62                         }
  63                 mutex_unlock(&mdsc->mutex);
  64                 if (err)
  65                         return err;
  66         }
  67
  68         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
  69                                        USE_AUTH_MDS);
  70         if (IS_ERR(req))
  71                 return PTR_ERR(req);
  72         req->r_inode = igrab(inode);
  73         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
  74
  75         req->r_args.setlayout.layout.fl_stripe_unit =
  76                 cpu_to_le32(l.stripe_unit);
  77         req->r_args.setlayout.layout.fl_stripe_count =
  78                 cpu_to_le32(l.stripe_count);
  79         req->r_args.setlayout.layout.fl_object_size =
  80                 cpu_to_le32(l.object_size);
  81         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
  82         req->r_args.setlayout.layout.fl_pg_preferred = cpu_to_le32((s32)-1);
  83
  84         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
  85         ceph_mdsc_put_request(req);
  86         return err;
  87 }
  88
  89 /*
  90  * Return object name, size/offset information, and location (OSD
  91  * number, network address) for a given file offset.
  92  */
  93 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
  94 {
  95         struct ceph_ioctl_dataloc dl;
  96         struct inode *inode = file->f_dentry->d_inode;
  97         struct ceph_inode_info *ci = ceph_inode(inode);
  98         struct ceph_osd_client *osdc = &ceph_client(inode->i_sb)->osdc;
  99         u64 len = 1, olen;
 100         u64 tmp;
 101         struct ceph_object_layout ol;
 102         union ceph_pg pgid;
 103
 104         /* copy and validate */
 105         if (copy_from_user(&dl, arg, sizeof(dl)))
 106                 return -EFAULT;
 107
 108         down_read(&osdc->map_sem);
 109         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
 110                                       &dl.object_no, &dl.object_offset, &olen);
 111         dl.file_offset -= dl.object_offset;
 112         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
 113         dl.block_size = ceph_file_layout_su(ci->i_layout);
 114
 115         /* block_offset = object_offset % block_size */
 116         tmp = dl.object_offset;
 117         dl.block_offset = do_div(tmp, dl.block_size);
 118
 119         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 120                  ceph_ino(inode), dl.object_no);
 121         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
 122                                 osdc->osdmap);
 123
 124         pgid.pg64 = le64_to_cpu(ol.ol_pgid);
 125         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 126         if (dl.osd >= 0) {
 127                 struct ceph_entity_addr *a =
 128                         ceph_osd_addr(osdc->osdmap, dl.osd);
 129                 if (a)
 130                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 131         } else {
 132                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 133         }
 134         up_read(&osdc->map_sem);
 135
 136         /* send result back to user */
 137         if (copy_to_user(arg, &dl, sizeof(dl)))
 138                 return -EFAULT;
 139
 140         return 0;
 141 }
 142
 143 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 144 {
 145         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 146         switch (cmd) {
 147         case CEPH_IOC_GET_LAYOUT:
 148                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 149
 150         case CEPH_IOC_SET_LAYOUT:
 151                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 152
 153         case CEPH_IOC_GET_DATALOC:
 154                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 155         }
 156         return -ENOTTY;
 157 }