ceph: use i_ceph_lock instead of i_lock
[linux-2.6.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 =
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;
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         struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
46         struct ceph_ioctl_layout nl;
47         int err, i;
48
49         if (copy_from_user(&l, arg, sizeof(l)))
50                 return -EFAULT;
51
52         /* validate changed params against current layout */
53         err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
54         if (!err) {
55                 nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
56                 nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
57                 nl.object_size = ceph_file_layout_object_size(ci->i_layout);
58                 nl.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
59                 nl.preferred_osd =
60                                 (s32)le32_to_cpu(ci->i_layout.fl_pg_preferred);
61         } else
62                 return err;
63
64         if (l.stripe_count)
65                 nl.stripe_count = l.stripe_count;
66         if (l.stripe_unit)
67                 nl.stripe_unit = l.stripe_unit;
68         if (l.object_size)
69                 nl.object_size = l.object_size;
70         if (l.data_pool)
71                 nl.data_pool = l.data_pool;
72         if (l.preferred_osd)
73                 nl.preferred_osd = l.preferred_osd;
74
75         if ((nl.object_size & ~PAGE_MASK) ||
76             (nl.stripe_unit & ~PAGE_MASK) ||
77             ((unsigned)nl.object_size % (unsigned)nl.stripe_unit))
78                 return -EINVAL;
79
80         /* make sure it's a valid data pool */
81         if (l.data_pool > 0) {
82                 mutex_lock(&mdsc->mutex);
83                 err = -EINVAL;
84                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
85                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
86                                 err = 0;
87                                 break;
88                         }
89                 mutex_unlock(&mdsc->mutex);
90                 if (err)
91                         return err;
92         }
93
94         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
95                                        USE_AUTH_MDS);
96         if (IS_ERR(req))
97                 return PTR_ERR(req);
98         req->r_inode = inode;
99         ihold(inode);
100         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
101
102         req->r_args.setlayout.layout.fl_stripe_unit =
103                 cpu_to_le32(l.stripe_unit);
104         req->r_args.setlayout.layout.fl_stripe_count =
105                 cpu_to_le32(l.stripe_count);
106         req->r_args.setlayout.layout.fl_object_size =
107                 cpu_to_le32(l.object_size);
108         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
109         req->r_args.setlayout.layout.fl_pg_preferred =
110                 cpu_to_le32(l.preferred_osd);
111
112         parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
113         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
114         iput(parent_inode);
115         ceph_mdsc_put_request(req);
116         return err;
117 }
118
119 /*
120  * Set a layout policy on a directory inode. All items in the tree
121  * rooted at this inode will inherit this layout on creation,
122  * (It doesn't apply retroactively )
123  * unless a subdirectory has its own layout policy.
124  */
125 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
126 {
127         struct inode *inode = file->f_dentry->d_inode;
128         struct ceph_mds_request *req;
129         struct ceph_ioctl_layout l;
130         int err, i;
131         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
132
133         /* copy and validate */
134         if (copy_from_user(&l, arg, sizeof(l)))
135                 return -EFAULT;
136
137         if ((l.object_size & ~PAGE_MASK) ||
138             (l.stripe_unit & ~PAGE_MASK) ||
139             !l.stripe_unit ||
140             (l.object_size &&
141                 (unsigned)l.object_size % (unsigned)l.stripe_unit))
142                 return -EINVAL;
143
144         /* make sure it's a valid data pool */
145         if (l.data_pool > 0) {
146                 mutex_lock(&mdsc->mutex);
147                 err = -EINVAL;
148                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
149                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
150                                 err = 0;
151                                 break;
152                         }
153                 mutex_unlock(&mdsc->mutex);
154                 if (err)
155                         return err;
156         }
157
158         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
159                                        USE_AUTH_MDS);
160
161         if (IS_ERR(req))
162                 return PTR_ERR(req);
163         req->r_inode = inode;
164         ihold(inode);
165
166         req->r_args.setlayout.layout.fl_stripe_unit =
167                         cpu_to_le32(l.stripe_unit);
168         req->r_args.setlayout.layout.fl_stripe_count =
169                         cpu_to_le32(l.stripe_count);
170         req->r_args.setlayout.layout.fl_object_size =
171                         cpu_to_le32(l.object_size);
172         req->r_args.setlayout.layout.fl_pg_pool =
173                         cpu_to_le32(l.data_pool);
174         req->r_args.setlayout.layout.fl_pg_preferred =
175                         cpu_to_le32(l.preferred_osd);
176
177         err = ceph_mdsc_do_request(mdsc, inode, req);
178         ceph_mdsc_put_request(req);
179         return err;
180 }
181
182 /*
183  * Return object name, size/offset information, and location (OSD
184  * number, network address) for a given file offset.
185  */
186 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
187 {
188         struct ceph_ioctl_dataloc dl;
189         struct inode *inode = file->f_dentry->d_inode;
190         struct ceph_inode_info *ci = ceph_inode(inode);
191         struct ceph_osd_client *osdc =
192                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
193         u64 len = 1, olen;
194         u64 tmp;
195         struct ceph_object_layout ol;
196         struct ceph_pg pgid;
197
198         /* copy and validate */
199         if (copy_from_user(&dl, arg, sizeof(dl)))
200                 return -EFAULT;
201
202         down_read(&osdc->map_sem);
203         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
204                                       &dl.object_no, &dl.object_offset, &olen);
205         dl.file_offset -= dl.object_offset;
206         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
207         dl.block_size = ceph_file_layout_su(ci->i_layout);
208
209         /* block_offset = object_offset % block_size */
210         tmp = dl.object_offset;
211         dl.block_offset = do_div(tmp, dl.block_size);
212
213         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
214                  ceph_ino(inode), dl.object_no);
215         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
216                                 osdc->osdmap);
217
218         pgid = ol.ol_pgid;
219         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
220         if (dl.osd >= 0) {
221                 struct ceph_entity_addr *a =
222                         ceph_osd_addr(osdc->osdmap, dl.osd);
223                 if (a)
224                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
225         } else {
226                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
227         }
228         up_read(&osdc->map_sem);
229
230         /* send result back to user */
231         if (copy_to_user(arg, &dl, sizeof(dl)))
232                 return -EFAULT;
233
234         return 0;
235 }
236
237 static long ceph_ioctl_lazyio(struct file *file)
238 {
239         struct ceph_file_info *fi = file->private_data;
240         struct inode *inode = file->f_dentry->d_inode;
241         struct ceph_inode_info *ci = ceph_inode(inode);
242
243         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
244                 spin_lock(&ci->i_ceph_lock);
245                 ci->i_nr_by_mode[fi->fmode]--;
246                 fi->fmode |= CEPH_FILE_MODE_LAZY;
247                 ci->i_nr_by_mode[fi->fmode]++;
248                 spin_unlock(&ci->i_ceph_lock);
249                 dout("ioctl_layzio: file %p marked lazy\n", file);
250
251                 ceph_check_caps(ci, 0, NULL);
252         } else {
253                 dout("ioctl_layzio: file %p already lazy\n", file);
254         }
255         return 0;
256 }
257
258 static long ceph_ioctl_syncio(struct file *file)
259 {
260         struct ceph_file_info *fi = file->private_data;
261
262         fi->flags |= CEPH_F_SYNC;
263         return 0;
264 }
265
266 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
267 {
268         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
269         switch (cmd) {
270         case CEPH_IOC_GET_LAYOUT:
271                 return ceph_ioctl_get_layout(file, (void __user *)arg);
272
273         case CEPH_IOC_SET_LAYOUT:
274                 return ceph_ioctl_set_layout(file, (void __user *)arg);
275
276         case CEPH_IOC_SET_LAYOUT_POLICY:
277                 return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
278
279         case CEPH_IOC_GET_DATALOC:
280                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
281
282         case CEPH_IOC_LAZYIO:
283                 return ceph_ioctl_lazyio(file);
284
285         case CEPH_IOC_SYNCIO:
286                 return ceph_ioctl_syncio(file);
287         }
288
289         return -ENOTTY;
290 }