fs/ceph/ioctl.c

   1 #include <linux/in.h>
   2
   3 #include "super.h"
   4 #include "mds_client.h"
   5 #include <linux/ceph/ceph_debug.h>
   6
   7 #include "ioctl.h"
   8
   9
  10 /*
  11  * ioctls
  12  */
  13
  14 /*
  15  * get and set the file layout
  16  */
  17 static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
  18 {
  19         struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
  20         struct ceph_ioctl_layout l;
  21         int err;
  22
  23         err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
  24         if (!err) {
  25                 l.stripe_unit = ceph_file_layout_su(ci->i_layout);
  26                 l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  27                 l.object_size = ceph_file_layout_object_size(ci->i_layout);
  28                 l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
  29                 l.preferred_osd =
  30                         (s32)le32_to_cpu(ci->i_layout.fl_pg_preferred);
  31                 if (copy_to_user(arg, &l, sizeof(l)))
  32                         return -EFAULT;
  33         }
  34
  35         return err;
  36 }
  37
  38 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
  39 {
  40         struct inode *inode = file->f_dentry->d_inode;
  41         struct inode *parent_inode;
  42         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
  43         struct ceph_mds_request *req;
  44         struct ceph_ioctl_layout l;
  45         int err, i;
  46
  47         /* copy and validate */
  48         if (copy_from_user(&l, arg, sizeof(l)))
  49                 return -EFAULT;
  50
  51         if ((l.object_size & ~PAGE_MASK) ||
  52             (l.stripe_unit & ~PAGE_MASK) ||
  53             !l.stripe_unit ||
  54             (l.object_size &&
  55              (unsigned)l.object_size % (unsigned)l.stripe_unit))
  56                 return -EINVAL;
  57
  58         /* make sure it's a valid data pool */
  59         if (l.data_pool > 0) {
  60                 mutex_lock(&mdsc->mutex);
  61                 err = -EINVAL;
  62                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  63                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
  64                                 err = 0;
  65                                 break;
  66                         }
  67                 mutex_unlock(&mdsc->mutex);
  68                 if (err)
  69                         return err;
  70         }
  71
  72         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
  73                                        USE_AUTH_MDS);
  74         if (IS_ERR(req))
  75                 return PTR_ERR(req);
  76         req->r_inode = inode;
  77         ihold(inode);
  78         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
  79
  80         req->r_args.setlayout.layout.fl_stripe_unit =
  81                 cpu_to_le32(l.stripe_unit);
  82         req->r_args.setlayout.layout.fl_stripe_count =
  83                 cpu_to_le32(l.stripe_count);
  84         req->r_args.setlayout.layout.fl_object_size =
  85                 cpu_to_le32(l.object_size);
  86         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
  87         req->r_args.setlayout.layout.fl_pg_preferred =
  88                 cpu_to_le32(l.preferred_osd);
  89
  90         parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
  91         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
  92         iput(parent_inode);
  93         ceph_mdsc_put_request(req);
  94         return err;
  95 }
  96
  97 /*
  98  * Set a layout policy on a directory inode. All items in the tree
  99  * rooted at this inode will inherit this layout on creation,
 100  * (It doesn't apply retroactively )
 101  * unless a subdirectory has its own layout policy.
 102  */
 103 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
 104 {
 105         struct inode *inode = file->f_dentry->d_inode;
 106         struct ceph_mds_request *req;
 107         struct ceph_ioctl_layout l;
 108         int err, i;
 109         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 110
 111         /* copy and validate */
 112         if (copy_from_user(&l, arg, sizeof(l)))
 113                 return -EFAULT;
 114
 115         if ((l.object_size & ~PAGE_MASK) ||
 116             (l.stripe_unit & ~PAGE_MASK) ||
 117             !l.stripe_unit ||
 118             (l.object_size &&
 119                 (unsigned)l.object_size % (unsigned)l.stripe_unit))
 120                 return -EINVAL;
 121
 122         /* make sure it's a valid data pool */
 123         if (l.data_pool > 0) {
 124                 mutex_lock(&mdsc->mutex);
 125                 err = -EINVAL;
 126                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
 127                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
 128                                 err = 0;
 129                                 break;
 130                         }
 131                 mutex_unlock(&mdsc->mutex);
 132                 if (err)
 133                         return err;
 134         }
 135
 136         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
 137                                        USE_AUTH_MDS);
 138
 139         if (IS_ERR(req))
 140                 return PTR_ERR(req);
 141         req->r_inode = inode;
 142         ihold(inode);
 143
 144         req->r_args.setlayout.layout.fl_stripe_unit =
 145                         cpu_to_le32(l.stripe_unit);
 146         req->r_args.setlayout.layout.fl_stripe_count =
 147                         cpu_to_le32(l.stripe_count);
 148         req->r_args.setlayout.layout.fl_object_size =
 149                         cpu_to_le32(l.object_size);
 150         req->r_args.setlayout.layout.fl_pg_pool =
 151                         cpu_to_le32(l.data_pool);
 152         req->r_args.setlayout.layout.fl_pg_preferred =
 153                         cpu_to_le32(l.preferred_osd);
 154
 155         err = ceph_mdsc_do_request(mdsc, inode, req);
 156         ceph_mdsc_put_request(req);
 157         return err;
 158 }
 159
 160 /*
 161  * Return object name, size/offset information, and location (OSD
 162  * number, network address) for a given file offset.
 163  */
 164 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 165 {
 166         struct ceph_ioctl_dataloc dl;
 167         struct inode *inode = file->f_dentry->d_inode;
 168         struct ceph_inode_info *ci = ceph_inode(inode);
 169         struct ceph_osd_client *osdc =
 170                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
 171         u64 len = 1, olen;
 172         u64 tmp;
 173         struct ceph_object_layout ol;
 174         struct ceph_pg pgid;
 175
 176         /* copy and validate */
 177         if (copy_from_user(&dl, arg, sizeof(dl)))
 178                 return -EFAULT;
 179
 180         down_read(&osdc->map_sem);
 181         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
 182                                       &dl.object_no, &dl.object_offset, &olen);
 183         dl.file_offset -= dl.object_offset;
 184         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
 185         dl.block_size = ceph_file_layout_su(ci->i_layout);
 186
 187         /* block_offset = object_offset % block_size */
 188         tmp = dl.object_offset;
 189         dl.block_offset = do_div(tmp, dl.block_size);
 190
 191         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 192                  ceph_ino(inode), dl.object_no);
 193         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
 194                                 osdc->osdmap);
 195
 196         pgid = ol.ol_pgid;
 197         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 198         if (dl.osd >= 0) {
 199                 struct ceph_entity_addr *a =
 200                         ceph_osd_addr(osdc->osdmap, dl.osd);
 201                 if (a)
 202                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 203         } else {
 204                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 205         }
 206         up_read(&osdc->map_sem);
 207
 208         /* send result back to user */
 209         if (copy_to_user(arg, &dl, sizeof(dl)))
 210                 return -EFAULT;
 211
 212         return 0;
 213 }
 214
 215 static long ceph_ioctl_lazyio(struct file *file)
 216 {
 217         struct ceph_file_info *fi = file->private_data;
 218         struct inode *inode = file->f_dentry->d_inode;
 219         struct ceph_inode_info *ci = ceph_inode(inode);
 220
 221         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
 222                 spin_lock(&inode->i_lock);
 223                 ci->i_nr_by_mode[fi->fmode]--;
 224                 fi->fmode |= CEPH_FILE_MODE_LAZY;
 225                 ci->i_nr_by_mode[fi->fmode]++;
 226                 spin_unlock(&inode->i_lock);
 227                 dout("ioctl_layzio: file %p marked lazy\n", file);
 228
 229                 ceph_check_caps(ci, 0, NULL);
 230         } else {
 231                 dout("ioctl_layzio: file %p already lazy\n", file);
 232         }
 233         return 0;
 234 }
 235
 236 static long ceph_ioctl_syncio(struct file *file)
 237 {
 238         struct ceph_file_info *fi = file->private_data;
 239
 240         fi->flags |= CEPH_F_SYNC;
 241         return 0;
 242 }
 243
 244 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 245 {
 246         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 247         switch (cmd) {
 248         case CEPH_IOC_GET_LAYOUT:
 249                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 250
 251         case CEPH_IOC_SET_LAYOUT:
 252                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 253
 254         case CEPH_IOC_SET_LAYOUT_POLICY:
 255                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
 256
 257         case CEPH_IOC_GET_DATALOC:
 258                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 259
 260         case CEPH_IOC_LAZYIO:
 261                 return ceph_ioctl_lazyio(file);
 262
 263         case CEPH_IOC_SYNCIO:
 264                 return ceph_ioctl_syncio(file);
 265         }
 266
 267         return -ENOTTY;
 268 }