xref: /openbmc/linux/fs/ceph/ioctl.c (revision d2999e1b)
1 #include <linux/ceph/ceph_debug.h>
2 #include <linux/in.h>
3 
4 #include "super.h"
5 #include "mds_client.h"
6 #include "ioctl.h"
7 
8 
9 /*
10  * ioctls
11  */
12 
13 /*
14  * get and set the file layout
15  */
16 static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
17 {
18 	struct ceph_inode_info *ci = ceph_inode(file_inode(file));
19 	struct ceph_ioctl_layout l;
20 	int err;
21 
22 	err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT);
23 	if (!err) {
24 		l.stripe_unit = ceph_file_layout_su(ci->i_layout);
25 		l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
26 		l.object_size = ceph_file_layout_object_size(ci->i_layout);
27 		l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
28 		l.preferred_osd = (s32)-1;
29 		if (copy_to_user(arg, &l, sizeof(l)))
30 			return -EFAULT;
31 	}
32 
33 	return err;
34 }
35 
36 static long __validate_layout(struct ceph_mds_client *mdsc,
37 			      struct ceph_ioctl_layout *l)
38 {
39 	int i, err;
40 
41 	/* validate striping parameters */
42 	if ((l->object_size & ~PAGE_MASK) ||
43 	    (l->stripe_unit & ~PAGE_MASK) ||
44 	    (l->stripe_unit != 0 &&
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_inode(file);
66 	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
67 	struct ceph_mds_request *req;
68 	struct ceph_ioctl_layout l;
69 	struct ceph_inode_info *ci = ceph_inode(file_inode(file));
70 	struct ceph_ioctl_layout nl;
71 	int err;
72 
73 	if (copy_from_user(&l, arg, sizeof(l)))
74 		return -EFAULT;
75 
76 	/* validate changed params against current layout */
77 	err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT);
78 	if (err)
79 		return err;
80 
81 	memset(&nl, 0, sizeof(nl));
82 	if (l.stripe_count)
83 		nl.stripe_count = l.stripe_count;
84 	else
85 		nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
86 	if (l.stripe_unit)
87 		nl.stripe_unit = l.stripe_unit;
88 	else
89 		nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
90 	if (l.object_size)
91 		nl.object_size = l.object_size;
92 	else
93 		nl.object_size = ceph_file_layout_object_size(ci->i_layout);
94 	if (l.data_pool)
95 		nl.data_pool = l.data_pool;
96 	else
97 		nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout);
98 
99 	/* this is obsolete, and always -1 */
100 	nl.preferred_osd = le64_to_cpu(-1);
101 
102 	err = __validate_layout(mdsc, &nl);
103 	if (err)
104 		return err;
105 
106 	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
107 				       USE_AUTH_MDS);
108 	if (IS_ERR(req))
109 		return PTR_ERR(req);
110 	req->r_inode = inode;
111 	ihold(inode);
112 	req->r_num_caps = 1;
113 
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 	err = ceph_mdsc_do_request(mdsc, NULL, req);
125 	ceph_mdsc_put_request(req);
126 	return err;
127 }
128 
129 /*
130  * Set a layout policy on a directory inode. All items in the tree
131  * rooted at this inode will inherit this layout on creation,
132  * (It doesn't apply retroactively )
133  * unless a subdirectory has its own layout policy.
134  */
135 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
136 {
137 	struct inode *inode = file_inode(file);
138 	struct ceph_mds_request *req;
139 	struct ceph_ioctl_layout l;
140 	int err;
141 	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
142 
143 	/* copy and validate */
144 	if (copy_from_user(&l, arg, sizeof(l)))
145 		return -EFAULT;
146 
147 	err = __validate_layout(mdsc, &l);
148 	if (err)
149 		return err;
150 
151 	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
152 				       USE_AUTH_MDS);
153 
154 	if (IS_ERR(req))
155 		return PTR_ERR(req);
156 	req->r_inode = inode;
157 	ihold(inode);
158 	req->r_num_caps = 1;
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_inode(file);
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 	struct ceph_object_locator oloc;
186 	struct ceph_object_id oid;
187 	u64 len = 1, olen;
188 	u64 tmp;
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 		up_read(&osdc->map_sem);
202 		return -EIO;
203 	}
204 	dl.file_offset -= dl.object_offset;
205 	dl.object_size = ceph_file_layout_object_size(ci->i_layout);
206 	dl.block_size = ceph_file_layout_su(ci->i_layout);
207 
208 	/* block_offset = object_offset % block_size */
209 	tmp = dl.object_offset;
210 	dl.block_offset = do_div(tmp, dl.block_size);
211 
212 	snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
213 		 ceph_ino(inode), dl.object_no);
214 
215 	oloc.pool = ceph_file_layout_pg_pool(ci->i_layout);
216 	ceph_oid_set_name(&oid, dl.object_name);
217 
218 	r = ceph_oloc_oid_to_pg(osdc->osdmap, &oloc, &oid, &pgid);
219 	if (r < 0) {
220 		up_read(&osdc->map_sem);
221 		return r;
222 	}
223 
224 	dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
225 	if (dl.osd >= 0) {
226 		struct ceph_entity_addr *a =
227 			ceph_osd_addr(osdc->osdmap, dl.osd);
228 		if (a)
229 			memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
230 	} else {
231 		memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
232 	}
233 	up_read(&osdc->map_sem);
234 
235 	/* send result back to user */
236 	if (copy_to_user(arg, &dl, sizeof(dl)))
237 		return -EFAULT;
238 
239 	return 0;
240 }
241 
242 static long ceph_ioctl_lazyio(struct file *file)
243 {
244 	struct ceph_file_info *fi = file->private_data;
245 	struct inode *inode = file_inode(file);
246 	struct ceph_inode_info *ci = ceph_inode(inode);
247 
248 	if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
249 		spin_lock(&ci->i_ceph_lock);
250 		ci->i_nr_by_mode[fi->fmode]--;
251 		fi->fmode |= CEPH_FILE_MODE_LAZY;
252 		ci->i_nr_by_mode[fi->fmode]++;
253 		spin_unlock(&ci->i_ceph_lock);
254 		dout("ioctl_layzio: file %p marked lazy\n", file);
255 
256 		ceph_check_caps(ci, 0, NULL);
257 	} else {
258 		dout("ioctl_layzio: file %p already lazy\n", file);
259 	}
260 	return 0;
261 }
262 
263 static long ceph_ioctl_syncio(struct file *file)
264 {
265 	struct ceph_file_info *fi = file->private_data;
266 
267 	fi->flags |= CEPH_F_SYNC;
268 	return 0;
269 }
270 
271 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
272 {
273 	dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
274 	switch (cmd) {
275 	case CEPH_IOC_GET_LAYOUT:
276 		return ceph_ioctl_get_layout(file, (void __user *)arg);
277 
278 	case CEPH_IOC_SET_LAYOUT:
279 		return ceph_ioctl_set_layout(file, (void __user *)arg);
280 
281 	case CEPH_IOC_SET_LAYOUT_POLICY:
282 		return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
283 
284 	case CEPH_IOC_GET_DATALOC:
285 		return ceph_ioctl_get_dataloc(file, (void __user *)arg);
286 
287 	case CEPH_IOC_LAZYIO:
288 		return ceph_ioctl_lazyio(file);
289 
290 	case CEPH_IOC_SYNCIO:
291 		return ceph_ioctl_syncio(file);
292 	}
293 
294 	return -ENOTTY;
295 }
296