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                 nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
  85                 nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  86                 nl.object_size = ceph_file_layout_object_size(ci->i_layout);
  87                 nl.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
  88         } else
  89                 return err;
  90
  91         if (l.stripe_count)
  92                 nl.stripe_count = l.stripe_count;
  93         if (l.stripe_unit)
  94                 nl.stripe_unit = l.stripe_unit;
  95         if (l.object_size)
  96                 nl.object_size = l.object_size;
  97         if (l.data_pool)
  98                 nl.data_pool = l.data_pool;
  99
 100         err = __validate_layout(mdsc, &nl);
 101         if (err)
 102                 return err;
 103
 104         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
 105                                        USE_AUTH_MDS);
 106         if (IS_ERR(req))
 107                 return PTR_ERR(req);
 108         req->r_inode = inode;
 109         ihold(inode);
 110         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
 111
 112         req->r_args.setlayout.layout.fl_stripe_unit =
 113                 cpu_to_le32(l.stripe_unit);
 114         req->r_args.setlayout.layout.fl_stripe_count =
 115                 cpu_to_le32(l.stripe_count);
 116         req->r_args.setlayout.layout.fl_object_size =
 117                 cpu_to_le32(l.object_size);
 118         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
 119
 120         parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
 121         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
 122         iput(parent_inode);
 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->f_dentry->d_inode;
 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->f_dentry->d_inode;
 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         u64 len = 1, olen;
 183         u64 tmp;
 184         struct ceph_object_layout ol;
 185         struct ceph_pg pgid;
 186
 187         /* copy and validate */
 188         if (copy_from_user(&dl, arg, sizeof(dl)))
 189                 return -EFAULT;
 190
 191         down_read(&osdc->map_sem);
 192         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
 193                                       &dl.object_no, &dl.object_offset, &olen);
 194         dl.file_offset -= dl.object_offset;
 195         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
 196         dl.block_size = ceph_file_layout_su(ci->i_layout);
 197
 198         /* block_offset = object_offset % block_size */
 199         tmp = dl.object_offset;
 200         dl.block_offset = do_div(tmp, dl.block_size);
 201
 202         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 203                  ceph_ino(inode), dl.object_no);
 204         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
 205                                 osdc->osdmap);
 206
 207         pgid = ol.ol_pgid;
 208         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 209         if (dl.osd >= 0) {
 210                 struct ceph_entity_addr *a =
 211                         ceph_osd_addr(osdc->osdmap, dl.osd);
 212                 if (a)
 213                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 214         } else {
 215                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 216         }
 217         up_read(&osdc->map_sem);
 218
 219         /* send result back to user */
 220         if (copy_to_user(arg, &dl, sizeof(dl)))
 221                 return -EFAULT;
 222
 223         return 0;
 224 }
 225
 226 static long ceph_ioctl_lazyio(struct file *file)
 227 {
 228         struct ceph_file_info *fi = file->private_data;
 229         struct inode *inode = file->f_dentry->d_inode;
 230         struct ceph_inode_info *ci = ceph_inode(inode);
 231
 232         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
 233                 spin_lock(&ci->i_ceph_lock);
 234                 ci->i_nr_by_mode[fi->fmode]--;
 235                 fi->fmode |= CEPH_FILE_MODE_LAZY;
 236                 ci->i_nr_by_mode[fi->fmode]++;
 237                 spin_unlock(&ci->i_ceph_lock);
 238                 dout("ioctl_layzio: file %p marked lazy\n", file);
 239
 240                 ceph_check_caps(ci, 0, NULL);
 241         } else {
 242                 dout("ioctl_layzio: file %p already lazy\n", file);
 243         }
 244         return 0;
 245 }
 246
 247 static long ceph_ioctl_syncio(struct file *file)
 248 {
 249         struct ceph_file_info *fi = file->private_data;
 250
 251         fi->flags |= CEPH_F_SYNC;
 252         return 0;
 253 }
 254
 255 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 256 {
 257         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 258         switch (cmd) {
 259         case CEPH_IOC_GET_LAYOUT:
 260                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 261
 262         case CEPH_IOC_SET_LAYOUT:
 263                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 264
 265         case CEPH_IOC_SET_LAYOUT_POLICY:
 266                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
 267
 268         case CEPH_IOC_GET_DATALOC:
 269                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 270
 271         case CEPH_IOC_LAZYIO:
 272                 return ceph_ioctl_lazyio(file);
 273
 274         case CEPH_IOC_SYNCIO:
 275                 return ceph_ioctl_syncio(file);
 276         }
 277
 278         return -ENOTTY;
 279 }