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         /* validate striping parameters */
  43         if ((l->object_size & ~PAGE_MASK) ||
  44             (l->stripe_unit & ~PAGE_MASK) ||
  45             ((unsigned)l->object_size % (unsigned)l->stripe_unit))
  46                 return -EINVAL;
  47
  48         /* make sure it's a valid data pool */
  49         mutex_lock(&mdsc->mutex);
  50         err = -EINVAL;
  51         for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  52                 if (mdsc->mdsmap->m_data_pg_pools[i] == l->data_pool) {
  53                         err = 0;
  54                         break;
  55                 }
  56         mutex_unlock(&mdsc->mutex);
  57         if (err)
  58                 return err;
  59
  60         return 0;
  61 }
  62
  63 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
  64 {
  65         struct inode *inode = file->f_dentry->d_inode;
  66         struct inode *parent_inode;
  67         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
  68         struct ceph_mds_request *req;
  69         struct ceph_ioctl_layout l;
  70         struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
  71         struct ceph_ioctl_layout nl;
  72         int err;
  73
  74         if (copy_from_user(&l, arg, sizeof(l)))
  75                 return -EFAULT;
  76
  77         /* validate changed params against current layout */
  78         err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
  79         if (err)
  80                 return err;
  81
  82         memset(&nl, 0, sizeof(nl));
  83         if (l.stripe_count)
  84                 nl.stripe_count = l.stripe_count;
  85         else
  86                 nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  87         if (l.stripe_unit)
  88                 nl.stripe_unit = l.stripe_unit;
  89         else
  90                 nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
  91         if (l.object_size)
  92                 nl.object_size = l.object_size;
  93         else
  94                 nl.object_size = ceph_file_layout_object_size(ci->i_layout);
  95         if (l.data_pool)
  96                 nl.data_pool = l.data_pool;
  97         else
  98                 nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout);
  99
 100         /* this is obsolete, and always -1 */
 101         nl.preferred_osd = le64_to_cpu(-1);
 102
 103         err = __validate_layout(mdsc, &nl);
 104         if (err)
 105                 return err;
 106
 107         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
 108                                        USE_AUTH_MDS);
 109         if (IS_ERR(req))
 110                 return PTR_ERR(req);
 111         req->r_inode = inode;
 112         ihold(inode);
 113         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
 114
 115         req->r_args.setlayout.layout.fl_stripe_unit =
 116                 cpu_to_le32(l.stripe_unit);
 117         req->r_args.setlayout.layout.fl_stripe_count =
 118                 cpu_to_le32(l.stripe_count);
 119         req->r_args.setlayout.layout.fl_object_size =
 120                 cpu_to_le32(l.object_size);
 121         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
 122
 123         parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
 124         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
 125         iput(parent_inode);
 126         ceph_mdsc_put_request(req);
 127         return err;
 128 }
 129
 130 /*
 131  * Set a layout policy on a directory inode. All items in the tree
 132  * rooted at this inode will inherit this layout on creation,
 133  * (It doesn't apply retroactively )
 134  * unless a subdirectory has its own layout policy.
 135  */
 136 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
 137 {
 138         struct inode *inode = file->f_dentry->d_inode;
 139         struct ceph_mds_request *req;
 140         struct ceph_ioctl_layout l;
 141         int err;
 142         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 143
 144         /* copy and validate */
 145         if (copy_from_user(&l, arg, sizeof(l)))
 146                 return -EFAULT;
 147
 148         err = __validate_layout(mdsc, &l);
 149         if (err)
 150                 return err;
 151
 152         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
 153                                        USE_AUTH_MDS);
 154
 155         if (IS_ERR(req))
 156                 return PTR_ERR(req);
 157         req->r_inode = inode;
 158         ihold(inode);
 159
 160         req->r_args.setlayout.layout.fl_stripe_unit =
 161                         cpu_to_le32(l.stripe_unit);
 162         req->r_args.setlayout.layout.fl_stripe_count =
 163                         cpu_to_le32(l.stripe_count);
 164         req->r_args.setlayout.layout.fl_object_size =
 165                         cpu_to_le32(l.object_size);
 166         req->r_args.setlayout.layout.fl_pg_pool =
 167                         cpu_to_le32(l.data_pool);
 168
 169         err = ceph_mdsc_do_request(mdsc, inode, req);
 170         ceph_mdsc_put_request(req);
 171         return err;
 172 }
 173
 174 /*
 175  * Return object name, size/offset information, and location (OSD
 176  * number, network address) for a given file offset.
 177  */
 178 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 179 {
 180         struct ceph_ioctl_dataloc dl;
 181         struct inode *inode = file->f_dentry->d_inode;
 182         struct ceph_inode_info *ci = ceph_inode(inode);
 183         struct ceph_osd_client *osdc =
 184                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
 185         u64 len = 1, olen;
 186         u64 tmp;
 187         struct ceph_object_layout ol;
 188         struct ceph_pg pgid;
 189
 190         /* copy and validate */
 191         if (copy_from_user(&dl, arg, sizeof(dl)))
 192                 return -EFAULT;
 193
 194         down_read(&osdc->map_sem);
 195         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
 196                                       &dl.object_no, &dl.object_offset, &olen);
 197         dl.file_offset -= dl.object_offset;
 198         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
 199         dl.block_size = ceph_file_layout_su(ci->i_layout);
 200
 201         /* block_offset = object_offset % block_size */
 202         tmp = dl.object_offset;
 203         dl.block_offset = do_div(tmp, dl.block_size);
 204
 205         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 206                  ceph_ino(inode), dl.object_no);
 207         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
 208                                 osdc->osdmap);
 209
 210         pgid = ol.ol_pgid;
 211         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 212         if (dl.osd >= 0) {
 213                 struct ceph_entity_addr *a =
 214                         ceph_osd_addr(osdc->osdmap, dl.osd);
 215                 if (a)
 216                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 217         } else {
 218                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 219         }
 220         up_read(&osdc->map_sem);
 221
 222         /* send result back to user */
 223         if (copy_to_user(arg, &dl, sizeof(dl)))
 224                 return -EFAULT;
 225
 226         return 0;
 227 }
 228
 229 static long ceph_ioctl_lazyio(struct file *file)
 230 {
 231         struct ceph_file_info *fi = file->private_data;
 232         struct inode *inode = file->f_dentry->d_inode;
 233         struct ceph_inode_info *ci = ceph_inode(inode);
 234
 235         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
 236                 spin_lock(&ci->i_ceph_lock);
 237                 ci->i_nr_by_mode[fi->fmode]--;
 238                 fi->fmode |= CEPH_FILE_MODE_LAZY;
 239                 ci->i_nr_by_mode[fi->fmode]++;
 240                 spin_unlock(&ci->i_ceph_lock);
 241                 dout("ioctl_layzio: file %p marked lazy\n", file);
 242
 243                 ceph_check_caps(ci, 0, NULL);
 244         } else {
 245                 dout("ioctl_layzio: file %p already lazy\n", file);
 246         }
 247         return 0;
 248 }
 249
 250 static long ceph_ioctl_syncio(struct file *file)
 251 {
 252         struct ceph_file_info *fi = file->private_data;
 253
 254         fi->flags |= CEPH_F_SYNC;
 255         return 0;
 256 }
 257
 258 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 259 {
 260         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 261         switch (cmd) {
 262         case CEPH_IOC_GET_LAYOUT:
 263                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 264
 265         case CEPH_IOC_SET_LAYOUT:
 266                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 267
 268         case CEPH_IOC_SET_LAYOUT_POLICY:
 269                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
 270
 271         case CEPH_IOC_GET_DATALOC:
 272                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 273
 274         case CEPH_IOC_LAZYIO:
 275                 return ceph_ioctl_lazyio(file);
 276
 277         case CEPH_IOC_SYNCIO:
 278                 return ceph_ioctl_syncio(file);
 279         }
 280
 281         return -ENOTTY;
 282 }