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