fs/ceph/ioctl.c

   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                 l.preferred_osd =
  28                         (s32)le32_to_cpu(ci->i_layout.fl_pg_preferred);
  29                 if (copy_to_user(arg, &l, sizeof(l)))
  30                         return -EFAULT;
  31         }
  32
  33         return err;
  34 }
  35
  36 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
  37 {
  38         struct inode *inode = file->f_dentry->d_inode;
  39         struct inode *parent_inode = file->f_dentry->d_parent->d_inode;
  40         struct ceph_mds_client *mdsc = &ceph_sb_to_client(inode->i_sb)->mdsc;
  41         struct ceph_mds_request *req;
  42         struct ceph_ioctl_layout l;
  43         int err, i;
  44
  45         /* copy and validate */
  46         if (copy_from_user(&l, arg, sizeof(l)))
  47                 return -EFAULT;
  48
  49         if ((l.object_size & ~PAGE_MASK) ||
  50             (l.stripe_unit & ~PAGE_MASK) ||
  51             !l.stripe_unit ||
  52             (l.object_size &&
  53              (unsigned)l.object_size % (unsigned)l.stripe_unit))
  54                 return -EINVAL;
  55
  56         /* make sure it's a valid data pool */
  57         if (l.data_pool > 0) {
  58                 mutex_lock(&mdsc->mutex);
  59                 err = -EINVAL;
  60                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  61                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
  62                                 err = 0;
  63                                 break;
  64                         }
  65                 mutex_unlock(&mdsc->mutex);
  66                 if (err)
  67                         return err;
  68         }
  69
  70         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
  71                                        USE_AUTH_MDS);
  72         if (IS_ERR(req))
  73                 return PTR_ERR(req);
  74         req->r_inode = igrab(inode);
  75         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
  76
  77         req->r_args.setlayout.layout.fl_stripe_unit =
  78                 cpu_to_le32(l.stripe_unit);
  79         req->r_args.setlayout.layout.fl_stripe_count =
  80                 cpu_to_le32(l.stripe_count);
  81         req->r_args.setlayout.layout.fl_object_size =
  82                 cpu_to_le32(l.object_size);
  83         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
  84         req->r_args.setlayout.layout.fl_pg_preferred =
  85                 cpu_to_le32(l.preferred_osd);
  86
  87         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
  88         ceph_mdsc_put_request(req);
  89         return err;
  90 }
  91
  92 /*
  93  * Return object name, size/offset information, and location (OSD
  94  * number, network address) for a given file offset.
  95  */
  96 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
  97 {
  98         struct ceph_ioctl_dataloc dl;
  99         struct inode *inode = file->f_dentry->d_inode;
 100         struct ceph_inode_info *ci = ceph_inode(inode);
 101         struct ceph_osd_client *osdc = &ceph_client(inode->i_sb)->osdc;
 102         u64 len = 1, olen;
 103         u64 tmp;
 104         struct ceph_object_layout ol;
 105         struct ceph_pg pgid;
 106
 107         /* copy and validate */
 108         if (copy_from_user(&dl, arg, sizeof(dl)))
 109                 return -EFAULT;
 110
 111         down_read(&osdc->map_sem);
 112         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
 113                                       &dl.object_no, &dl.object_offset, &olen);
 114         dl.file_offset -= dl.object_offset;
 115         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
 116         dl.block_size = ceph_file_layout_su(ci->i_layout);
 117
 118         /* block_offset = object_offset % block_size */
 119         tmp = dl.object_offset;
 120         dl.block_offset = do_div(tmp, dl.block_size);
 121
 122         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 123                  ceph_ino(inode), dl.object_no);
 124         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
 125                                 osdc->osdmap);
 126
 127         pgid = ol.ol_pgid;
 128         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 129         if (dl.osd >= 0) {
 130                 struct ceph_entity_addr *a =
 131                         ceph_osd_addr(osdc->osdmap, dl.osd);
 132                 if (a)
 133                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 134         } else {
 135                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 136         }
 137         up_read(&osdc->map_sem);
 138
 139         /* send result back to user */
 140         if (copy_to_user(arg, &dl, sizeof(dl)))
 141                 return -EFAULT;
 142
 143         return 0;
 144 }
 145
 146 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 147 {
 148         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 149         switch (cmd) {
 150         case CEPH_IOC_GET_LAYOUT:
 151                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 152
 153         case CEPH_IOC_SET_LAYOUT:
 154                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 155
 156         case CEPH_IOC_GET_DATALOC:
 157                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 158         }
 159         return -ENOTTY;
 160 }