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 = (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         /* preferred_osd is no longer supported */
  43         if (l->preferred_osd != -1)
  44                 return -EINVAL;
  45
  46         /* validate striping parameters */
  47         if ((l->object_size & ~PAGE_MASK) ||
  48             (l->stripe_unit & ~PAGE_MASK) ||
  49             ((unsigned)l->object_size % (unsigned)l->stripe_unit))
  50                 return -EINVAL;
  51
  52         /* make sure it's a valid data pool */
  53         mutex_lock(&mdsc->mutex);
  54         err = -EINVAL;
  55         for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  56                 if (mdsc->mdsmap->m_data_pg_pools[i] == l->data_pool) {
  57                         err = 0;
  58                         break;
  59                 }
  60         mutex_unlock(&mdsc->mutex);
  61         if (err)
  62                 return err;
  63
  64         return 0;
  65 }
  66
  67 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
  68 {
  69         struct inode *inode = file->f_dentry->d_inode;
  70         struct inode *parent_inode;
  71         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
  72         struct ceph_mds_request *req;
  73         struct ceph_ioctl_layout l;
  74         struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
  75         struct ceph_ioctl_layout nl;
  76         int err;
  77
  78         if (copy_from_user(&l, arg, sizeof(l)))
  79                 return -EFAULT;
  80
  81         /* validate changed params against current layout */
  82         err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
  83         if (err)
  84                 return err;
  85
  86         memset(&nl, 0, sizeof(nl));
  87         if (l.stripe_count)
  88                 nl.stripe_count = l.stripe_count;
  89         else
  90                 nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  91         if (l.stripe_unit)
  92                 nl.stripe_unit = l.stripe_unit;
  93         else
  94                 nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
  95         if (l.object_size)
  96                 nl.object_size = l.object_size;
  97         else
  98                 nl.object_size = ceph_file_layout_object_size(ci->i_layout);
  99         if (l.data_pool)
 100                 nl.data_pool = l.data_pool;
 101         else
 102                 nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout);
 103
 104         /* this is obsolete, and always -1 */
 105         nl.preferred_osd = le64_to_cpu(-1);
 106
 107         err = __validate_layout(mdsc, &nl);
 108         if (err)
 109                 return err;
 110
 111         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
 112                                        USE_AUTH_MDS);
 113         if (IS_ERR(req))
 114                 return PTR_ERR(req);
 115         req->r_inode = inode;
 116         ihold(inode);
 117         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
 118
 119         req->r_args.setlayout.layout.fl_stripe_unit =
 120                 cpu_to_le32(l.stripe_unit);
 121         req->r_args.setlayout.layout.fl_stripe_count =
 122                 cpu_to_le32(l.stripe_count);
 123         req->r_args.setlayout.layout.fl_object_size =
 124                 cpu_to_le32(l.object_size);
 125         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
 126
 127         parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
 128         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
 129         iput(parent_inode);
 130         ceph_mdsc_put_request(req);
 131         return err;
 132 }
 133
 134 /*
 135  * Set a layout policy on a directory inode. All items in the tree
 136  * rooted at this inode will inherit this layout on creation,
 137  * (It doesn't apply retroactively )
 138  * unless a subdirectory has its own layout policy.
 139  */
 140 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
 141 {
 142         struct inode *inode = file->f_dentry->d_inode;
 143         struct ceph_mds_request *req;
 144         struct ceph_ioctl_layout l;
 145         int err;
 146         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 147
 148         /* copy and validate */
 149         if (copy_from_user(&l, arg, sizeof(l)))
 150                 return -EFAULT;
 151
 152         err = __validate_layout(mdsc, &l);
 153         if (err)
 154                 return err;
 155
 156         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
 157                                        USE_AUTH_MDS);
 158
 159         if (IS_ERR(req))
 160                 return PTR_ERR(req);
 161         req->r_inode = inode;
 162         ihold(inode);
 163
 164         req->r_args.setlayout.layout.fl_stripe_unit =
 165                         cpu_to_le32(l.stripe_unit);
 166         req->r_args.setlayout.layout.fl_stripe_count =
 167                         cpu_to_le32(l.stripe_count);
 168         req->r_args.setlayout.layout.fl_object_size =
 169                         cpu_to_le32(l.object_size);
 170         req->r_args.setlayout.layout.fl_pg_pool =
 171                         cpu_to_le32(l.data_pool);
 172
 173         err = ceph_mdsc_do_request(mdsc, inode, req);
 174         ceph_mdsc_put_request(req);
 175         return err;
 176 }
 177
 178 /*
 179  * Return object name, size/offset information, and location (OSD
 180  * number, network address) for a given file offset.
 181  */
 182 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 183 {
 184         struct ceph_ioctl_dataloc dl;
 185         struct inode *inode = file->f_dentry->d_inode;
 186         struct ceph_inode_info *ci = ceph_inode(inode);
 187         struct ceph_osd_client *osdc =
 188                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
 189         u64 len = 1, olen;
 190         u64 tmp;
 191         struct ceph_object_layout ol;
 192         struct ceph_pg pgid;
 193
 194         /* copy and validate */
 195         if (copy_from_user(&dl, arg, sizeof(dl)))
 196                 return -EFAULT;
 197
 198         down_read(&osdc->map_sem);
 199         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
 200                                       &dl.object_no, &dl.object_offset, &olen);
 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(&ol, dl.object_name, &ci->i_layout,
 212                                 osdc->osdmap);
 213
 214         pgid = ol.ol_pgid;
 215         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 216         if (dl.osd >= 0) {
 217                 struct ceph_entity_addr *a =
 218                         ceph_osd_addr(osdc->osdmap, dl.osd);
 219                 if (a)
 220                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 221         } else {
 222                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 223         }
 224         up_read(&osdc->map_sem);
 225
 226         /* send result back to user */
 227         if (copy_to_user(arg, &dl, sizeof(dl)))
 228                 return -EFAULT;
 229
 230         return 0;
 231 }
 232
 233 static long ceph_ioctl_lazyio(struct file *file)
 234 {
 235         struct ceph_file_info *fi = file->private_data;
 236         struct inode *inode = file->f_dentry->d_inode;
 237         struct ceph_inode_info *ci = ceph_inode(inode);
 238
 239         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
 240                 spin_lock(&ci->i_ceph_lock);
 241                 ci->i_nr_by_mode[fi->fmode]--;
 242                 fi->fmode |= CEPH_FILE_MODE_LAZY;
 243                 ci->i_nr_by_mode[fi->fmode]++;
 244                 spin_unlock(&ci->i_ceph_lock);
 245                 dout("ioctl_layzio: file %p marked lazy\n", file);
 246
 247                 ceph_check_caps(ci, 0, NULL);
 248         } else {
 249                 dout("ioctl_layzio: file %p already lazy\n", file);
 250         }
 251         return 0;
 252 }
 253
 254 static long ceph_ioctl_syncio(struct file *file)
 255 {
 256         struct ceph_file_info *fi = file->private_data;
 257
 258         fi->flags |= CEPH_F_SYNC;
 259         return 0;
 260 }
 261
 262 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 263 {
 264         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 265         switch (cmd) {
 266         case CEPH_IOC_GET_LAYOUT:
 267                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 268
 269         case CEPH_IOC_SET_LAYOUT:
 270                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 271
 272         case CEPH_IOC_SET_LAYOUT_POLICY:
 273                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
 274
 275         case CEPH_IOC_GET_DATALOC:
 276                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 277
 278         case CEPH_IOC_LAZYIO:
 279                 return ceph_ioctl_lazyio(file);
 280
 281         case CEPH_IOC_SYNCIO:
 282                 return ceph_ioctl_syncio(file);
 283         }
 284
 285         return -ENOTTY;
 286 }