3b22150d3e1949dd97d5d3ea1eacfa50e11b9eec
[linux-3.10.git] / 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             (l->stripe_unit != 0 &&
46              ((unsigned)l->object_size % (unsigned)l->stripe_unit)))
47                 return -EINVAL;
48
49         /* make sure it's a valid data pool */
50         mutex_lock(&mdsc->mutex);
51         err = -EINVAL;
52         for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
53                 if (mdsc->mdsmap->m_data_pg_pools[i] == l->data_pool) {
54                         err = 0;
55                         break;
56                 }
57         mutex_unlock(&mdsc->mutex);
58         if (err)
59                 return err;
60
61         return 0;
62 }
63
64 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
65 {
66         struct inode *inode = file->f_dentry->d_inode;
67         struct inode *parent_inode;
68         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
69         struct ceph_mds_request *req;
70         struct ceph_ioctl_layout l;
71         struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
72         struct ceph_ioctl_layout nl;
73         int err;
74
75         if (copy_from_user(&l, arg, sizeof(l)))
76                 return -EFAULT;
77
78         /* validate changed params against current layout */
79         err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
80         if (err)
81                 return err;
82
83         memset(&nl, 0, sizeof(nl));
84         if (l.stripe_count)
85                 nl.stripe_count = l.stripe_count;
86         else
87                 nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
88         if (l.stripe_unit)
89                 nl.stripe_unit = l.stripe_unit;
90         else
91                 nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
92         if (l.object_size)
93                 nl.object_size = l.object_size;
94         else
95                 nl.object_size = ceph_file_layout_object_size(ci->i_layout);
96         if (l.data_pool)
97                 nl.data_pool = l.data_pool;
98         else
99                 nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout);
100
101         /* this is obsolete, and always -1 */
102         nl.preferred_osd = le64_to_cpu(-1);
103
104         err = __validate_layout(mdsc, &nl);
105         if (err)
106                 return err;
107
108         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
109                                        USE_AUTH_MDS);
110         if (IS_ERR(req))
111                 return PTR_ERR(req);
112         req->r_inode = inode;
113         ihold(inode);
114         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
115
116         req->r_args.setlayout.layout.fl_stripe_unit =
117                 cpu_to_le32(l.stripe_unit);
118         req->r_args.setlayout.layout.fl_stripe_count =
119                 cpu_to_le32(l.stripe_count);
120         req->r_args.setlayout.layout.fl_object_size =
121                 cpu_to_le32(l.object_size);
122         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
123
124         parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
125         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
126         iput(parent_inode);
127         ceph_mdsc_put_request(req);
128         return err;
129 }
130
131 /*
132  * Set a layout policy on a directory inode. All items in the tree
133  * rooted at this inode will inherit this layout on creation,
134  * (It doesn't apply retroactively )
135  * unless a subdirectory has its own layout policy.
136  */
137 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
138 {
139         struct inode *inode = file->f_dentry->d_inode;
140         struct ceph_mds_request *req;
141         struct ceph_ioctl_layout l;
142         int err;
143         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
144
145         /* copy and validate */
146         if (copy_from_user(&l, arg, sizeof(l)))
147                 return -EFAULT;
148
149         err = __validate_layout(mdsc, &l);
150         if (err)
151                 return err;
152
153         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
154                                        USE_AUTH_MDS);
155
156         if (IS_ERR(req))
157                 return PTR_ERR(req);
158         req->r_inode = inode;
159         ihold(inode);
160
161         req->r_args.setlayout.layout.fl_stripe_unit =
162                         cpu_to_le32(l.stripe_unit);
163         req->r_args.setlayout.layout.fl_stripe_count =
164                         cpu_to_le32(l.stripe_count);
165         req->r_args.setlayout.layout.fl_object_size =
166                         cpu_to_le32(l.object_size);
167         req->r_args.setlayout.layout.fl_pg_pool =
168                         cpu_to_le32(l.data_pool);
169
170         err = ceph_mdsc_do_request(mdsc, inode, req);
171         ceph_mdsc_put_request(req);
172         return err;
173 }
174
175 /*
176  * Return object name, size/offset information, and location (OSD
177  * number, network address) for a given file offset.
178  */
179 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
180 {
181         struct ceph_ioctl_dataloc dl;
182         struct inode *inode = file->f_dentry->d_inode;
183         struct ceph_inode_info *ci = ceph_inode(inode);
184         struct ceph_osd_client *osdc =
185                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
186         u64 len = 1, olen;
187         u64 tmp;
188         struct ceph_object_layout ol;
189         struct ceph_pg pgid;
190         int r;
191
192         /* copy and validate */
193         if (copy_from_user(&dl, arg, sizeof(dl)))
194                 return -EFAULT;
195
196         down_read(&osdc->map_sem);
197         r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len,
198                                           &dl.object_no, &dl.object_offset,
199                                           &olen);
200         if (r < 0)
201                 return -EIO;
202         dl.file_offset -= dl.object_offset;
203         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
204         dl.block_size = ceph_file_layout_su(ci->i_layout);
205
206         /* block_offset = object_offset % block_size */
207         tmp = dl.object_offset;
208         dl.block_offset = do_div(tmp, dl.block_size);
209
210         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
211                  ceph_ino(inode), dl.object_no);
212         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
213                                 osdc->osdmap);
214
215         pgid = ol.ol_pgid;
216         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
217         if (dl.osd >= 0) {
218                 struct ceph_entity_addr *a =
219                         ceph_osd_addr(osdc->osdmap, dl.osd);
220                 if (a)
221                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
222         } else {
223                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
224         }
225         up_read(&osdc->map_sem);
226
227         /* send result back to user */
228         if (copy_to_user(arg, &dl, sizeof(dl)))
229                 return -EFAULT;
230
231         return 0;
232 }
233
234 static long ceph_ioctl_lazyio(struct file *file)
235 {
236         struct ceph_file_info *fi = file->private_data;
237         struct inode *inode = file->f_dentry->d_inode;
238         struct ceph_inode_info *ci = ceph_inode(inode);
239
240         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
241                 spin_lock(&ci->i_ceph_lock);
242                 ci->i_nr_by_mode[fi->fmode]--;
243                 fi->fmode |= CEPH_FILE_MODE_LAZY;
244                 ci->i_nr_by_mode[fi->fmode]++;
245                 spin_unlock(&ci->i_ceph_lock);
246                 dout("ioctl_layzio: file %p marked lazy\n", file);
247
248                 ceph_check_caps(ci, 0, NULL);
249         } else {
250                 dout("ioctl_layzio: file %p already lazy\n", file);
251         }
252         return 0;
253 }
254
255 static long ceph_ioctl_syncio(struct file *file)
256 {
257         struct ceph_file_info *fi = file->private_data;
258
259         fi->flags |= CEPH_F_SYNC;
260         return 0;
261 }
262
263 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
264 {
265         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
266         switch (cmd) {
267         case CEPH_IOC_GET_LAYOUT:
268                 return ceph_ioctl_get_layout(file, (void __user *)arg);
269
270         case CEPH_IOC_SET_LAYOUT:
271                 return ceph_ioctl_set_layout(file, (void __user *)arg);
272
273         case CEPH_IOC_SET_LAYOUT_POLICY:
274                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
275
276         case CEPH_IOC_GET_DATALOC:
277                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
278
279         case CEPH_IOC_LAZYIO:
280                 return ceph_ioctl_lazyio(file);
281
282         case CEPH_IOC_SYNCIO:
283                 return ceph_ioctl_syncio(file);
284         }
285
286         return -ENOTTY;
287 }