fs/ceph/ioctl.c

   1 #include <linux/ceph/ceph_debug.h>
   2 #include <linux/in.h>
   3
   4 #include "super.h"
   5 #include "mds_client.h"
   6 #include "ioctl.h"
   7
   8
   9 /*
  10  * ioctls
  11  */
  12
  13 /*
  14  * get and set the file layout
  15  */
  16 static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
  17 {
  18         struct ceph_inode_info *ci = ceph_inode(file_inode(file));
  19         struct ceph_ioctl_layout l;
  20         int err;
  21
  22         err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT, false);
  23         if (!err) {
  24                 l.stripe_unit = ci->i_layout.stripe_unit;
  25                 l.stripe_count = ci->i_layout.stripe_count;
  26                 l.object_size = ci->i_layout.object_size;
  27                 l.data_pool = ci->i_layout.pool_id;
  28                 l.preferred_osd = -1;
  29                 if (copy_to_user(arg, &l, sizeof(l)))
  30                         return -EFAULT;
  31         }
  32
  33         return err;
  34 }
  35
  36 static long __validate_layout(struct ceph_mds_client *mdsc,
  37                               struct ceph_ioctl_layout *l)
  38 {
  39         int i, err;
  40
  41         /* validate striping parameters */
  42         if ((l->object_size & ~PAGE_MASK) ||
  43             (l->stripe_unit & ~PAGE_MASK) ||
  44             ((unsigned)l->stripe_unit != 0 &&
  45              ((unsigned)l->object_size % (unsigned)l->stripe_unit)))
  46                 return -EINVAL;
  47
  48         /* make sure it's a valid data pool */
  49         mutex_lock(&mdsc->mutex);
  50         err = -EINVAL;
  51         for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  52                 if (mdsc->mdsmap->m_data_pg_pools[i] == l->data_pool) {
  53                         err = 0;
  54                         break;
  55                 }
  56         mutex_unlock(&mdsc->mutex);
  57         if (err)
  58                 return err;
  59
  60         return 0;
  61 }
  62
  63 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
  64 {
  65         struct inode *inode = file_inode(file);
  66         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
  67         struct ceph_mds_request *req;
  68         struct ceph_ioctl_layout l;
  69         struct ceph_inode_info *ci = ceph_inode(file_inode(file));
  70         struct ceph_ioctl_layout nl;
  71         int err;
  72
  73         if (copy_from_user(&l, arg, sizeof(l)))
  74                 return -EFAULT;
  75
  76         /* validate changed params against current layout */
  77         err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT, false);
  78         if (err)
  79                 return err;
  80
  81         memset(&nl, 0, sizeof(nl));
  82         if (l.stripe_count)
  83                 nl.stripe_count = l.stripe_count;
  84         else
  85                 nl.stripe_count = ci->i_layout.stripe_count;
  86         if (l.stripe_unit)
  87                 nl.stripe_unit = l.stripe_unit;
  88         else
  89                 nl.stripe_unit = ci->i_layout.stripe_unit;
  90         if (l.object_size)
  91                 nl.object_size = l.object_size;
  92         else
  93                 nl.object_size = ci->i_layout.object_size;
  94         if (l.data_pool)
  95                 nl.data_pool = l.data_pool;
  96         else
  97                 nl.data_pool = ci->i_layout.pool_id;
  98
  99         /* this is obsolete, and always -1 */
 100         nl.preferred_osd = -1;
 101
 102         err = __validate_layout(mdsc, &nl);
 103         if (err)
 104                 return err;
 105
 106         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
 107                                        USE_AUTH_MDS);
 108         if (IS_ERR(req))
 109                 return PTR_ERR(req);
 110         req->r_inode = inode;
 111         ihold(inode);
 112         req->r_num_caps = 1;
 113
 114         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
 115
 116         req->r_args.setlayout.layout.fl_stripe_unit =
 117                 cpu_to_le32(l.stripe_unit);
 118         req->r_args.setlayout.layout.fl_stripe_count =
 119                 cpu_to_le32(l.stripe_count);
 120         req->r_args.setlayout.layout.fl_object_size =
 121                 cpu_to_le32(l.object_size);
 122         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
 123
 124         err = ceph_mdsc_do_request(mdsc, NULL, req);
 125         ceph_mdsc_put_request(req);
 126         return err;
 127 }
 128
 129 /*
 130  * Set a layout policy on a directory inode. All items in the tree
 131  * rooted at this inode will inherit this layout on creation,
 132  * (It doesn't apply retroactively )
 133  * unless a subdirectory has its own layout policy.
 134  */
 135 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
 136 {
 137         struct inode *inode = file_inode(file);
 138         struct ceph_mds_request *req;
 139         struct ceph_ioctl_layout l;
 140         int err;
 141         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 142
 143         /* copy and validate */
 144         if (copy_from_user(&l, arg, sizeof(l)))
 145                 return -EFAULT;
 146
 147         err = __validate_layout(mdsc, &l);
 148         if (err)
 149                 return err;
 150
 151         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
 152                                        USE_AUTH_MDS);
 153
 154         if (IS_ERR(req))
 155                 return PTR_ERR(req);
 156         req->r_inode = inode;
 157         ihold(inode);
 158         req->r_num_caps = 1;
 159
 160         req->r_args.setlayout.layout.fl_stripe_unit =
 161                         cpu_to_le32(l.stripe_unit);
 162         req->r_args.setlayout.layout.fl_stripe_count =
 163                         cpu_to_le32(l.stripe_count);
 164         req->r_args.setlayout.layout.fl_object_size =
 165                         cpu_to_le32(l.object_size);
 166         req->r_args.setlayout.layout.fl_pg_pool =
 167                         cpu_to_le32(l.data_pool);
 168
 169         err = ceph_mdsc_do_request(mdsc, inode, req);
 170         ceph_mdsc_put_request(req);
 171         return err;
 172 }
 173
 174 /*
 175  * Return object name, size/offset information, and location (OSD
 176  * number, network address) for a given file offset.
 177  */
 178 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 179 {
 180         struct ceph_ioctl_dataloc dl;
 181         struct inode *inode = file_inode(file);
 182         struct ceph_inode_info *ci = ceph_inode(inode);
 183         struct ceph_osd_client *osdc =
 184                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
 185         struct ceph_object_locator oloc;
 186         CEPH_DEFINE_OID_ONSTACK(oid);
 187         u64 len = 1, olen;
 188         u64 tmp;
 189         struct ceph_pg pgid;
 190         int r;
 191
 192         /* copy and validate */
 193         if (copy_from_user(&dl, arg, sizeof(dl)))
 194                 return -EFAULT;
 195
 196         down_read(&osdc->lock);
 197         r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len,
 198                                           &dl.object_no, &dl.object_offset,
 199                                           &olen);
 200         if (r < 0) {
 201                 up_read(&osdc->lock);
 202                 return -EIO;
 203         }
 204         dl.file_offset -= dl.object_offset;
 205         dl.object_size = ci->i_layout.object_size;
 206         dl.block_size = ci->i_layout.stripe_unit;
 207
 208         /* block_offset = object_offset % block_size */
 209         tmp = dl.object_offset;
 210         dl.block_offset = do_div(tmp, dl.block_size);
 211
 212         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 213                  ceph_ino(inode), dl.object_no);
 214
 215         oloc.pool = ci->i_layout.pool_id;
 216         oloc.pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
 217         ceph_oid_printf(&oid, "%s", dl.object_name);
 218
 219         r = ceph_object_locator_to_pg(osdc->osdmap, &oid, &oloc, &pgid);
 220
 221         ceph_oloc_destroy(&oloc);
 222         if (r < 0) {
 223                 up_read(&osdc->lock);
 224                 return r;
 225         }
 226
 227         dl.osd = ceph_pg_to_acting_primary(osdc->osdmap, &pgid);
 228         if (dl.osd >= 0) {
 229                 struct ceph_entity_addr *a =
 230                         ceph_osd_addr(osdc->osdmap, dl.osd);
 231                 if (a)
 232                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 233         } else {
 234                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 235         }
 236         up_read(&osdc->lock);
 237
 238         /* send result back to user */
 239         if (copy_to_user(arg, &dl, sizeof(dl)))
 240                 return -EFAULT;
 241
 242         return 0;
 243 }
 244
 245 static long ceph_ioctl_lazyio(struct file *file)
 246 {
 247         struct ceph_file_info *fi = file->private_data;
 248         struct inode *inode = file_inode(file);
 249         struct ceph_inode_info *ci = ceph_inode(inode);
 250
 251         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
 252                 spin_lock(&ci->i_ceph_lock);
 253                 fi->fmode |= CEPH_FILE_MODE_LAZY;
 254                 ci->i_nr_by_mode[ffs(CEPH_FILE_MODE_LAZY)]++;
 255                 spin_unlock(&ci->i_ceph_lock);
 256                 dout("ioctl_layzio: file %p marked lazy\n", file);
 257
 258                 ceph_check_caps(ci, 0, NULL);
 259         } else {
 260                 dout("ioctl_layzio: file %p already lazy\n", file);
 261         }
 262         return 0;
 263 }
 264
 265 static long ceph_ioctl_syncio(struct file *file)
 266 {
 267         struct ceph_file_info *fi = file->private_data;
 268
 269         fi->flags |= CEPH_F_SYNC;
 270         return 0;
 271 }
 272
 273 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 274 {
 275         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 276         switch (cmd) {
 277         case CEPH_IOC_GET_LAYOUT:
 278                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 279
 280         case CEPH_IOC_SET_LAYOUT:
 281                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 282
 283         case CEPH_IOC_SET_LAYOUT_POLICY:
 284                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
 285
 286         case CEPH_IOC_GET_DATALOC:
 287                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 288
 289         case CEPH_IOC_LAZYIO:
 290                 return ceph_ioctl_lazyio(file);
 291
 292         case CEPH_IOC_SYNCIO:
 293                 return ceph_ioctl_syncio(file);
 294         }
 295
 296         return -ENOTTY;
 297 }