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         struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
  46         struct ceph_ioctl_layout nl;
  47         int err, i;
  48
  49         if (copy_from_user(&l, arg, sizeof(l)))
  50                 return -EFAULT;
  51
  52         /* validate changed params against current layout */
  53         err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
  54         if (!err) {
  55                 nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
  56                 nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  57                 nl.object_size = ceph_file_layout_object_size(ci->i_layout);
  58                 nl.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
  59                 nl.preferred_osd =
  60                                 (s32)le32_to_cpu(ci->i_layout.fl_pg_preferred);
  61         } else
  62                 return err;
  63
  64         if (l.stripe_count)
  65                 nl.stripe_count = l.stripe_count;
  66         if (l.stripe_unit)
  67                 nl.stripe_unit = l.stripe_unit;
  68         if (l.object_size)
  69                 nl.object_size = l.object_size;
  70         if (l.data_pool)
  71                 nl.data_pool = l.data_pool;
  72         if (l.preferred_osd)
  73                 nl.preferred_osd = l.preferred_osd;
  74
  75         if ((nl.object_size & ~PAGE_MASK) ||
  76             (nl.stripe_unit & ~PAGE_MASK) ||
  77             ((unsigned)nl.object_size % (unsigned)nl.stripe_unit))
  78                 return -EINVAL;
  79
  80         /* make sure it's a valid data pool */
  81         if (l.data_pool > 0) {
  82                 mutex_lock(&mdsc->mutex);
  83                 err = -EINVAL;
  84                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  85                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
  86                                 err = 0;
  87                                 break;
  88                         }
  89                 mutex_unlock(&mdsc->mutex);
  90                 if (err)
  91                         return err;
  92         }
  93
  94         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
  95                                        USE_AUTH_MDS);
  96         if (IS_ERR(req))
  97                 return PTR_ERR(req);
  98         req->r_inode = inode;
  99         ihold(inode);
 100         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
 101
 102         req->r_args.setlayout.layout.fl_stripe_unit =
 103                 cpu_to_le32(l.stripe_unit);
 104         req->r_args.setlayout.layout.fl_stripe_count =
 105                 cpu_to_le32(l.stripe_count);
 106         req->r_args.setlayout.layout.fl_object_size =
 107                 cpu_to_le32(l.object_size);
 108         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
 109         req->r_args.setlayout.layout.fl_pg_preferred =
 110                 cpu_to_le32(l.preferred_osd);
 111
 112         parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
 113         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
 114         iput(parent_inode);
 115         ceph_mdsc_put_request(req);
 116         return err;
 117 }
 118
 119 /*
 120  * Set a layout policy on a directory inode. All items in the tree
 121  * rooted at this inode will inherit this layout on creation,
 122  * (It doesn't apply retroactively )
 123  * unless a subdirectory has its own layout policy.
 124  */
 125 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
 126 {
 127         struct inode *inode = file->f_dentry->d_inode;
 128         struct ceph_mds_request *req;
 129         struct ceph_ioctl_layout l;
 130         int err, i;
 131         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 132
 133         /* copy and validate */
 134         if (copy_from_user(&l, arg, sizeof(l)))
 135                 return -EFAULT;
 136
 137         if ((l.object_size & ~PAGE_MASK) ||
 138             (l.stripe_unit & ~PAGE_MASK) ||
 139             !l.stripe_unit ||
 140             (l.object_size &&
 141                 (unsigned)l.object_size % (unsigned)l.stripe_unit))
 142                 return -EINVAL;
 143
 144         /* make sure it's a valid data pool */
 145         if (l.data_pool > 0) {
 146                 mutex_lock(&mdsc->mutex);
 147                 err = -EINVAL;
 148                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
 149                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
 150                                 err = 0;
 151                                 break;
 152                         }
 153                 mutex_unlock(&mdsc->mutex);
 154                 if (err)
 155                         return err;
 156         }
 157
 158         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
 159                                        USE_AUTH_MDS);
 160
 161         if (IS_ERR(req))
 162                 return PTR_ERR(req);
 163         req->r_inode = inode;
 164         ihold(inode);
 165
 166         req->r_args.setlayout.layout.fl_stripe_unit =
 167                         cpu_to_le32(l.stripe_unit);
 168         req->r_args.setlayout.layout.fl_stripe_count =
 169                         cpu_to_le32(l.stripe_count);
 170         req->r_args.setlayout.layout.fl_object_size =
 171                         cpu_to_le32(l.object_size);
 172         req->r_args.setlayout.layout.fl_pg_pool =
 173                         cpu_to_le32(l.data_pool);
 174         req->r_args.setlayout.layout.fl_pg_preferred =
 175                         cpu_to_le32(l.preferred_osd);
 176
 177         err = ceph_mdsc_do_request(mdsc, inode, req);
 178         ceph_mdsc_put_request(req);
 179         return err;
 180 }
 181
 182 /*
 183  * Return object name, size/offset information, and location (OSD
 184  * number, network address) for a given file offset.
 185  */
 186 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 187 {
 188         struct ceph_ioctl_dataloc dl;
 189         struct inode *inode = file->f_dentry->d_inode;
 190         struct ceph_inode_info *ci = ceph_inode(inode);
 191         struct ceph_osd_client *osdc =
 192                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
 193         u64 len = 1, olen;
 194         u64 tmp;
 195         struct ceph_object_layout ol;
 196         struct ceph_pg pgid;
 197
 198         /* copy and validate */
 199         if (copy_from_user(&dl, arg, sizeof(dl)))
 200                 return -EFAULT;
 201
 202         down_read(&osdc->map_sem);
 203         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
 204                                       &dl.object_no, &dl.object_offset, &olen);
 205         dl.file_offset -= dl.object_offset;
 206         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
 207         dl.block_size = ceph_file_layout_su(ci->i_layout);
 208
 209         /* block_offset = object_offset % block_size */
 210         tmp = dl.object_offset;
 211         dl.block_offset = do_div(tmp, dl.block_size);
 212
 213         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 214                  ceph_ino(inode), dl.object_no);
 215         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
 216                                 osdc->osdmap);
 217
 218         pgid = ol.ol_pgid;
 219         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 220         if (dl.osd >= 0) {
 221                 struct ceph_entity_addr *a =
 222                         ceph_osd_addr(osdc->osdmap, dl.osd);
 223                 if (a)
 224                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 225         } else {
 226                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 227         }
 228         up_read(&osdc->map_sem);
 229
 230         /* send result back to user */
 231         if (copy_to_user(arg, &dl, sizeof(dl)))
 232                 return -EFAULT;
 233
 234         return 0;
 235 }
 236
 237 static long ceph_ioctl_lazyio(struct file *file)
 238 {
 239         struct ceph_file_info *fi = file->private_data;
 240         struct inode *inode = file->f_dentry->d_inode;
 241         struct ceph_inode_info *ci = ceph_inode(inode);
 242
 243         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
 244                 spin_lock(&ci->i_ceph_lock);
 245                 ci->i_nr_by_mode[fi->fmode]--;
 246                 fi->fmode |= CEPH_FILE_MODE_LAZY;
 247                 ci->i_nr_by_mode[fi->fmode]++;
 248                 spin_unlock(&ci->i_ceph_lock);
 249                 dout("ioctl_layzio: file %p marked lazy\n", file);
 250
 251                 ceph_check_caps(ci, 0, NULL);
 252         } else {
 253                 dout("ioctl_layzio: file %p already lazy\n", file);
 254         }
 255         return 0;
 256 }
 257
 258 static long ceph_ioctl_syncio(struct file *file)
 259 {
 260         struct ceph_file_info *fi = file->private_data;
 261
 262         fi->flags |= CEPH_F_SYNC;
 263         return 0;
 264 }
 265
 266 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 267 {
 268         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 269         switch (cmd) {
 270         case CEPH_IOC_GET_LAYOUT:
 271                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 272
 273         case CEPH_IOC_SET_LAYOUT:
 274                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 275
 276         case CEPH_IOC_SET_LAYOUT_POLICY:
 277                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
 278
 279         case CEPH_IOC_GET_DATALOC:
 280                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 281
 282         case CEPH_IOC_LAZYIO:
 283                 return ceph_ioctl_lazyio(file);
 284
 285         case CEPH_IOC_SYNCIO:
 286                 return ceph_ioctl_syncio(file);
 287         }
 288
 289         return -ENOTTY;
 290 }