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);
  23         if (!err) {
  24                 l.stripe_unit = ceph_file_layout_su(ci->i_layout);
  25                 l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  26                 l.object_size = ceph_file_layout_object_size(ci->i_layout);
  27                 l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
  28                 l.preferred_osd = (s32)-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             (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);
  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 = ceph_file_layout_stripe_count(ci->i_layout);
  86         if (l.stripe_unit)
  87                 nl.stripe_unit = l.stripe_unit;
  88         else
  89                 nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
  90         if (l.object_size)
  91                 nl.object_size = l.object_size;
  92         else
  93                 nl.object_size = ceph_file_layout_object_size(ci->i_layout);
  94         if (l.data_pool)
  95                 nl.data_pool = l.data_pool;
  96         else
  97                 nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout);
  98
  99         /* this is obsolete, and always -1 */
 100         nl.preferred_osd = le64_to_cpu(-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_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
 113
 114         req->r_args.setlayout.layout.fl_stripe_unit =
 115                 cpu_to_le32(l.stripe_unit);
 116         req->r_args.setlayout.layout.fl_stripe_count =
 117                 cpu_to_le32(l.stripe_count);
 118         req->r_args.setlayout.layout.fl_object_size =
 119                 cpu_to_le32(l.object_size);
 120         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
 121
 122         err = ceph_mdsc_do_request(mdsc, NULL, req);
 123         ceph_mdsc_put_request(req);
 124         return err;
 125 }
 126
 127 /*
 128  * Set a layout policy on a directory inode. All items in the tree
 129  * rooted at this inode will inherit this layout on creation,
 130  * (It doesn't apply retroactively )
 131  * unless a subdirectory has its own layout policy.
 132  */
 133 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
 134 {
 135         struct inode *inode = file_inode(file);
 136         struct ceph_mds_request *req;
 137         struct ceph_ioctl_layout l;
 138         int err;
 139         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 140
 141         /* copy and validate */
 142         if (copy_from_user(&l, arg, sizeof(l)))
 143                 return -EFAULT;
 144
 145         err = __validate_layout(mdsc, &l);
 146         if (err)
 147                 return err;
 148
 149         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
 150                                        USE_AUTH_MDS);
 151
 152         if (IS_ERR(req))
 153                 return PTR_ERR(req);
 154         req->r_inode = inode;
 155         ihold(inode);
 156
 157         req->r_args.setlayout.layout.fl_stripe_unit =
 158                         cpu_to_le32(l.stripe_unit);
 159         req->r_args.setlayout.layout.fl_stripe_count =
 160                         cpu_to_le32(l.stripe_count);
 161         req->r_args.setlayout.layout.fl_object_size =
 162                         cpu_to_le32(l.object_size);
 163         req->r_args.setlayout.layout.fl_pg_pool =
 164                         cpu_to_le32(l.data_pool);
 165
 166         err = ceph_mdsc_do_request(mdsc, inode, req);
 167         ceph_mdsc_put_request(req);
 168         return err;
 169 }
 170
 171 /*
 172  * Return object name, size/offset information, and location (OSD
 173  * number, network address) for a given file offset.
 174  */
 175 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 176 {
 177         struct ceph_ioctl_dataloc dl;
 178         struct inode *inode = file_inode(file);
 179         struct ceph_inode_info *ci = ceph_inode(inode);
 180         struct ceph_osd_client *osdc =
 181                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
 182         struct ceph_object_locator oloc;
 183         struct ceph_object_id oid;
 184         u64 len = 1, olen;
 185         u64 tmp;
 186         struct ceph_pg pgid;
 187         int r;
 188
 189         /* copy and validate */
 190         if (copy_from_user(&dl, arg, sizeof(dl)))
 191                 return -EFAULT;
 192
 193         down_read(&osdc->map_sem);
 194         r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len,
 195                                           &dl.object_no, &dl.object_offset,
 196                                           &olen);
 197         if (r < 0) {
 198                 up_read(&osdc->map_sem);
 199                 return -EIO;
 200         }
 201         dl.file_offset -= dl.object_offset;
 202         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
 203         dl.block_size = ceph_file_layout_su(ci->i_layout);
 204
 205         /* block_offset = object_offset % block_size */
 206         tmp = dl.object_offset;
 207         dl.block_offset = do_div(tmp, dl.block_size);
 208
 209         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 210                  ceph_ino(inode), dl.object_no);
 211
 212         oloc.pool = ceph_file_layout_pg_pool(ci->i_layout);
 213         ceph_oid_set_name(&oid, dl.object_name);
 214
 215         r = ceph_oloc_oid_to_pg(osdc->osdmap, &oloc, &oid, &pgid);
 216         if (r < 0) {
 217                 up_read(&osdc->map_sem);
 218                 return r;
 219         }
 220
 221         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 222         if (dl.osd >= 0) {
 223                 struct ceph_entity_addr *a =
 224                         ceph_osd_addr(osdc->osdmap, dl.osd);
 225                 if (a)
 226                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 227         } else {
 228                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 229         }
 230         up_read(&osdc->map_sem);
 231
 232         /* send result back to user */
 233         if (copy_to_user(arg, &dl, sizeof(dl)))
 234                 return -EFAULT;
 235
 236         return 0;
 237 }
 238
 239 static long ceph_ioctl_lazyio(struct file *file)
 240 {
 241         struct ceph_file_info *fi = file->private_data;
 242         struct inode *inode = file_inode(file);
 243         struct ceph_inode_info *ci = ceph_inode(inode);
 244
 245         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
 246                 spin_lock(&ci->i_ceph_lock);
 247                 ci->i_nr_by_mode[fi->fmode]--;
 248                 fi->fmode |= CEPH_FILE_MODE_LAZY;
 249                 ci->i_nr_by_mode[fi->fmode]++;
 250                 spin_unlock(&ci->i_ceph_lock);
 251                 dout("ioctl_layzio: file %p marked lazy\n", file);
 252
 253                 ceph_check_caps(ci, 0, NULL);
 254         } else {
 255                 dout("ioctl_layzio: file %p already lazy\n", file);
 256         }
 257         return 0;
 258 }
 259
 260 static long ceph_ioctl_syncio(struct file *file)
 261 {
 262         struct ceph_file_info *fi = file->private_data;
 263
 264         fi->flags |= CEPH_F_SYNC;
 265         return 0;
 266 }
 267
 268 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 269 {
 270         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 271         switch (cmd) {
 272         case CEPH_IOC_GET_LAYOUT:
 273                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 274
 275         case CEPH_IOC_SET_LAYOUT:
 276                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 277
 278         case CEPH_IOC_SET_LAYOUT_POLICY:
 279                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
 280
 281         case CEPH_IOC_GET_DATALOC:
 282                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 283
 284         case CEPH_IOC_LAZYIO:
 285                 return ceph_ioctl_lazyio(file);
 286
 287         case CEPH_IOC_SYNCIO:
 288                 return ceph_ioctl_syncio(file);
 289         }
 290
 291         return -ENOTTY;
 292 }