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_inode(file));
  20         struct ceph_ioctl_layout l;
  21         int err;
  22
  23         err = ceph_do_getattr(file_inode(file), 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 = (s32)-1;
  30                 if (copy_to_user(arg, &l, sizeof(l)))
  31                         return -EFAULT;
  32         }
  33
  34         return err;
  35 }
  36
  37 static long __validate_layout(struct ceph_mds_client *mdsc,
  38                               struct ceph_ioctl_layout *l)
  39 {
  40         int i, err;
  41
  42         /* validate striping parameters */
  43         if ((l->object_size & ~PAGE_MASK) ||
  44             (l->stripe_unit & ~PAGE_MASK) ||
  45             (l->stripe_unit != 0 &&
  46              ((unsigned)l->object_size % (unsigned)l->stripe_unit)))
  47                 return -EINVAL;
  48
  49         /* make sure it's a valid data pool */
  50         mutex_lock(&mdsc->mutex);
  51         err = -EINVAL;
  52         for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  53                 if (mdsc->mdsmap->m_data_pg_pools[i] == l->data_pool) {
  54                         err = 0;
  55                         break;
  56                 }
  57         mutex_unlock(&mdsc->mutex);
  58         if (err)
  59                 return err;
  60
  61         return 0;
  62 }
  63
  64 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
  65 {
  66         struct inode *inode = file_inode(file);
  67         struct inode *parent_inode;
  68         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
  69         struct ceph_mds_request *req;
  70         struct ceph_ioctl_layout l;
  71         struct ceph_inode_info *ci = ceph_inode(file_inode(file));
  72         struct ceph_ioctl_layout nl;
  73         int err;
  74
  75         if (copy_from_user(&l, arg, sizeof(l)))
  76                 return -EFAULT;
  77
  78         /* validate changed params against current layout */
  79         err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT);
  80         if (err)
  81                 return err;
  82
  83         memset(&nl, 0, sizeof(nl));
  84         if (l.stripe_count)
  85                 nl.stripe_count = l.stripe_count;
  86         else
  87                 nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  88         if (l.stripe_unit)
  89                 nl.stripe_unit = l.stripe_unit;
  90         else
  91                 nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
  92         if (l.object_size)
  93                 nl.object_size = l.object_size;
  94         else
  95                 nl.object_size = ceph_file_layout_object_size(ci->i_layout);
  96         if (l.data_pool)
  97                 nl.data_pool = l.data_pool;
  98         else
  99                 nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout);
 100
 101         /* this is obsolete, and always -1 */
 102         nl.preferred_osd = le64_to_cpu(-1);
 103
 104         err = __validate_layout(mdsc, &nl);
 105         if (err)
 106                 return err;
 107
 108         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
 109                                        USE_AUTH_MDS);
 110         if (IS_ERR(req))
 111                 return PTR_ERR(req);
 112         req->r_inode = inode;
 113         ihold(inode);
 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         parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
 125         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
 126         iput(parent_inode);
 127         ceph_mdsc_put_request(req);
 128         return err;
 129 }
 130
 131 /*
 132  * Set a layout policy on a directory inode. All items in the tree
 133  * rooted at this inode will inherit this layout on creation,
 134  * (It doesn't apply retroactively )
 135  * unless a subdirectory has its own layout policy.
 136  */
 137 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
 138 {
 139         struct inode *inode = file_inode(file);
 140         struct ceph_mds_request *req;
 141         struct ceph_ioctl_layout l;
 142         int err;
 143         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 144
 145         /* copy and validate */
 146         if (copy_from_user(&l, arg, sizeof(l)))
 147                 return -EFAULT;
 148
 149         err = __validate_layout(mdsc, &l);
 150         if (err)
 151                 return err;
 152
 153         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
 154                                        USE_AUTH_MDS);
 155
 156         if (IS_ERR(req))
 157                 return PTR_ERR(req);
 158         req->r_inode = inode;
 159         ihold(inode);
 160
 161         req->r_args.setlayout.layout.fl_stripe_unit =
 162                         cpu_to_le32(l.stripe_unit);
 163         req->r_args.setlayout.layout.fl_stripe_count =
 164                         cpu_to_le32(l.stripe_count);
 165         req->r_args.setlayout.layout.fl_object_size =
 166                         cpu_to_le32(l.object_size);
 167         req->r_args.setlayout.layout.fl_pg_pool =
 168                         cpu_to_le32(l.data_pool);
 169
 170         err = ceph_mdsc_do_request(mdsc, inode, req);
 171         ceph_mdsc_put_request(req);
 172         return err;
 173 }
 174
 175 /*
 176  * Return object name, size/offset information, and location (OSD
 177  * number, network address) for a given file offset.
 178  */
 179 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 180 {
 181         struct ceph_ioctl_dataloc dl;
 182         struct inode *inode = file_inode(file);
 183         struct ceph_inode_info *ci = ceph_inode(inode);
 184         struct ceph_osd_client *osdc =
 185                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
 186         u64 len = 1, olen;
 187         u64 tmp;
 188         struct ceph_pg pgid;
 189         int r;
 190
 191         /* copy and validate */
 192         if (copy_from_user(&dl, arg, sizeof(dl)))
 193                 return -EFAULT;
 194
 195         down_read(&osdc->map_sem);
 196         r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len,
 197                                           &dl.object_no, &dl.object_offset,
 198                                           &olen);
 199         if (r < 0)
 200                 return -EIO;
 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         ceph_calc_object_layout(&pgid, dl.object_name, &ci->i_layout,
 212                                 osdc->osdmap);
 213
 214         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 215         if (dl.osd >= 0) {
 216                 struct ceph_entity_addr *a =
 217                         ceph_osd_addr(osdc->osdmap, dl.osd);
 218                 if (a)
 219                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 220         } else {
 221                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 222         }
 223         up_read(&osdc->map_sem);
 224
 225         /* send result back to user */
 226         if (copy_to_user(arg, &dl, sizeof(dl)))
 227                 return -EFAULT;
 228
 229         return 0;
 230 }
 231
 232 static long ceph_ioctl_lazyio(struct file *file)
 233 {
 234         struct ceph_file_info *fi = file->private_data;
 235         struct inode *inode = file_inode(file);
 236         struct ceph_inode_info *ci = ceph_inode(inode);
 237
 238         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
 239                 spin_lock(&ci->i_ceph_lock);
 240                 ci->i_nr_by_mode[fi->fmode]--;
 241                 fi->fmode |= CEPH_FILE_MODE_LAZY;
 242                 ci->i_nr_by_mode[fi->fmode]++;
 243                 spin_unlock(&ci->i_ceph_lock);
 244                 dout("ioctl_layzio: file %p marked lazy\n", file);
 245
 246                 ceph_check_caps(ci, 0, NULL);
 247         } else {
 248                 dout("ioctl_layzio: file %p already lazy\n", file);
 249         }
 250         return 0;
 251 }
 252
 253 static long ceph_ioctl_syncio(struct file *file)
 254 {
 255         struct ceph_file_info *fi = file->private_data;
 256
 257         fi->flags |= CEPH_F_SYNC;
 258         return 0;
 259 }
 260
 261 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 262 {
 263         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 264         switch (cmd) {
 265         case CEPH_IOC_GET_LAYOUT:
 266                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 267
 268         case CEPH_IOC_SET_LAYOUT:
 269                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 270
 271         case CEPH_IOC_SET_LAYOUT_POLICY:
 272                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
 273
 274         case CEPH_IOC_GET_DATALOC:
 275                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 276
 277         case CEPH_IOC_LAZYIO:
 278                 return ceph_ioctl_lazyio(file);
 279
 280         case CEPH_IOC_SYNCIO:
 281                 return ceph_ioctl_syncio(file);
 282         }
 283
 284         return -ENOTTY;
 285 }