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 ceph_ioctl_set_layout(struct file *file, void __user *arg)
  38 {
  39         struct inode *inode = file->f_dentry->d_inode;
  40         struct inode *parent_inode;
  41         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
  42         struct ceph_mds_request *req;
  43         struct ceph_ioctl_layout l;
  44         struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
  45         struct ceph_ioctl_layout nl;
  46         int err, i;
  47
  48         if (copy_from_user(&l, arg, sizeof(l)))
  49                 return -EFAULT;
  50
  51         /* preferred_osd is no longer supported */
  52         if (l.preferred_osd != -1)
  53                 return -EINVAL;
  54
  55         /* validate changed params against current layout */
  56         err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
  57         if (!err) {
  58                 nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
  59                 nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
  60                 nl.object_size = ceph_file_layout_object_size(ci->i_layout);
  61                 nl.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
  62         } else
  63                 return err;
  64
  65         if (l.stripe_count)
  66                 nl.stripe_count = l.stripe_count;
  67         if (l.stripe_unit)
  68                 nl.stripe_unit = l.stripe_unit;
  69         if (l.object_size)
  70                 nl.object_size = l.object_size;
  71         if (l.data_pool)
  72                 nl.data_pool = l.data_pool;
  73
  74         if ((nl.object_size & ~PAGE_MASK) ||
  75             (nl.stripe_unit & ~PAGE_MASK) ||
  76             ((unsigned)nl.object_size % (unsigned)nl.stripe_unit))
  77                 return -EINVAL;
  78
  79         /* make sure it's a valid data pool */
  80         if (l.data_pool > 0) {
  81                 mutex_lock(&mdsc->mutex);
  82                 err = -EINVAL;
  83                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
  84                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
  85                                 err = 0;
  86                                 break;
  87                         }
  88                 mutex_unlock(&mdsc->mutex);
  89                 if (err)
  90                         return err;
  91         }
  92
  93         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
  94                                        USE_AUTH_MDS);
  95         if (IS_ERR(req))
  96                 return PTR_ERR(req);
  97         req->r_inode = inode;
  98         ihold(inode);
  99         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
 100
 101         req->r_args.setlayout.layout.fl_stripe_unit =
 102                 cpu_to_le32(l.stripe_unit);
 103         req->r_args.setlayout.layout.fl_stripe_count =
 104                 cpu_to_le32(l.stripe_count);
 105         req->r_args.setlayout.layout.fl_object_size =
 106                 cpu_to_le32(l.object_size);
 107         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
 108
 109         parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
 110         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
 111         iput(parent_inode);
 112         ceph_mdsc_put_request(req);
 113         return err;
 114 }
 115
 116 /*
 117  * Set a layout policy on a directory inode. All items in the tree
 118  * rooted at this inode will inherit this layout on creation,
 119  * (It doesn't apply retroactively )
 120  * unless a subdirectory has its own layout policy.
 121  */
 122 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
 123 {
 124         struct inode *inode = file->f_dentry->d_inode;
 125         struct ceph_mds_request *req;
 126         struct ceph_ioctl_layout l;
 127         int err, i;
 128         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
 129
 130         /* copy and validate */
 131         if (copy_from_user(&l, arg, sizeof(l)))
 132                 return -EFAULT;
 133
 134         if ((l.object_size & ~PAGE_MASK) ||
 135             (l.stripe_unit & ~PAGE_MASK) ||
 136             !l.stripe_unit ||
 137             (l.object_size &&
 138                 (unsigned)l.object_size % (unsigned)l.stripe_unit))
 139                 return -EINVAL;
 140
 141         /* make sure it's a valid data pool */
 142         if (l.data_pool > 0) {
 143                 mutex_lock(&mdsc->mutex);
 144                 err = -EINVAL;
 145                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
 146                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
 147                                 err = 0;
 148                                 break;
 149                         }
 150                 mutex_unlock(&mdsc->mutex);
 151                 if (err)
 152                         return err;
 153         }
 154
 155         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
 156                                        USE_AUTH_MDS);
 157
 158         if (IS_ERR(req))
 159                 return PTR_ERR(req);
 160         req->r_inode = inode;
 161         ihold(inode);
 162
 163         req->r_args.setlayout.layout.fl_stripe_unit =
 164                         cpu_to_le32(l.stripe_unit);
 165         req->r_args.setlayout.layout.fl_stripe_count =
 166                         cpu_to_le32(l.stripe_count);
 167         req->r_args.setlayout.layout.fl_object_size =
 168                         cpu_to_le32(l.object_size);
 169         req->r_args.setlayout.layout.fl_pg_pool =
 170                         cpu_to_le32(l.data_pool);
 171
 172         err = ceph_mdsc_do_request(mdsc, inode, req);
 173         ceph_mdsc_put_request(req);
 174         return err;
 175 }
 176
 177 /*
 178  * Return object name, size/offset information, and location (OSD
 179  * number, network address) for a given file offset.
 180  */
 181 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 182 {
 183         struct ceph_ioctl_dataloc dl;
 184         struct inode *inode = file->f_dentry->d_inode;
 185         struct ceph_inode_info *ci = ceph_inode(inode);
 186         struct ceph_osd_client *osdc =
 187                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
 188         u64 len = 1, olen;
 189         u64 tmp;
 190         struct ceph_object_layout ol;
 191         struct ceph_pg pgid;
 192
 193         /* copy and validate */
 194         if (copy_from_user(&dl, arg, sizeof(dl)))
 195                 return -EFAULT;
 196
 197         down_read(&osdc->map_sem);
 198         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
 199                                       &dl.object_no, &dl.object_offset, &olen);
 200         dl.file_offset -= dl.object_offset;
 201         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
 202         dl.block_size = ceph_file_layout_su(ci->i_layout);
 203
 204         /* block_offset = object_offset % block_size */
 205         tmp = dl.object_offset;
 206         dl.block_offset = do_div(tmp, dl.block_size);
 207
 208         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 209                  ceph_ino(inode), dl.object_no);
 210         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
 211                                 osdc->osdmap);
 212
 213         pgid = ol.ol_pgid;
 214         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 215         if (dl.osd >= 0) {
 216                 struct ceph_entity_addr *a =
 217                         ceph_osd_addr(osdc->osdmap, dl.osd);
 218                 if (a)
 219                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
 220         } else {
 221                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
 222         }
 223         up_read(&osdc->map_sem);
 224
 225         /* send result back to user */
 226         if (copy_to_user(arg, &dl, sizeof(dl)))
 227                 return -EFAULT;
 228
 229         return 0;
 230 }
 231
 232 static long ceph_ioctl_lazyio(struct file *file)
 233 {
 234         struct ceph_file_info *fi = file->private_data;
 235         struct inode *inode = file->f_dentry->d_inode;
 236         struct ceph_inode_info *ci = ceph_inode(inode);
 237
 238         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
 239                 spin_lock(&ci->i_ceph_lock);
 240                 ci->i_nr_by_mode[fi->fmode]--;
 241                 fi->fmode |= CEPH_FILE_MODE_LAZY;
 242                 ci->i_nr_by_mode[fi->fmode]++;
 243                 spin_unlock(&ci->i_ceph_lock);
 244                 dout("ioctl_layzio: file %p marked lazy\n", file);
 245
 246                 ceph_check_caps(ci, 0, NULL);
 247         } else {
 248                 dout("ioctl_layzio: file %p already lazy\n", file);
 249         }
 250         return 0;
 251 }
 252
 253 static long ceph_ioctl_syncio(struct file *file)
 254 {
 255         struct ceph_file_info *fi = file->private_data;
 256
 257         fi->flags |= CEPH_F_SYNC;
 258         return 0;
 259 }
 260
 261 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 262 {
 263         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
 264         switch (cmd) {
 265         case CEPH_IOC_GET_LAYOUT:
 266                 return ceph_ioctl_get_layout(file, (void __user *)arg);
 267
 268         case CEPH_IOC_SET_LAYOUT:
 269                 return ceph_ioctl_set_layout(file, (void __user *)arg);
 270
 271         case CEPH_IOC_SET_LAYOUT_POLICY:
 272                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
 273
 274         case CEPH_IOC_GET_DATALOC:
 275                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
 276
 277         case CEPH_IOC_LAZYIO:
 278                 return ceph_ioctl_lazyio(file);
 279
 280         case CEPH_IOC_SYNCIO:
 281                 return ceph_ioctl_syncio(file);
 282         }
 283
 284         return -ENOTTY;
 285 }