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