1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3 #include <linux/in.h>
4 
5 #include "super.h"
6 #include "mds_client.h"
7 #include "ioctl.h"
8 #include <linux/ceph/striper.h>
9 
10 /*
11  * ioctls
12  */
13 
14 /*
15  * get and set the file layout
16  */
ceph_ioctl_get_layout(struct file * file,void __user * arg)17 static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
18 {
19 	struct ceph_inode_info *ci = ceph_inode(file_inode(file));
20 	struct ceph_ioctl_layout l;
21 	int err;
22 
23 	err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT, false);
24 	if (!err) {
25 		l.stripe_unit = ci->i_layout.stripe_unit;
26 		l.stripe_count = ci->i_layout.stripe_count;
27 		l.object_size = ci->i_layout.object_size;
28 		l.data_pool = ci->i_layout.pool_id;
29 		l.preferred_osd = -1;
30 		if (copy_to_user(arg, &l, sizeof(l)))
31 			return -EFAULT;
32 	}
33 
34 	return err;
35 }
36 
__validate_layout(struct ceph_mds_client * mdsc,struct ceph_ioctl_layout * l)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->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 
ceph_ioctl_set_layout(struct file * file,void __user * arg)64 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
65 {
66 	struct inode *inode = file_inode(file);
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_inode(file));
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_inode(file), CEPH_STAT_CAP_LAYOUT, false);
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 = ci->i_layout.stripe_count;
87 	if (l.stripe_unit)
88 		nl.stripe_unit = l.stripe_unit;
89 	else
90 		nl.stripe_unit = ci->i_layout.stripe_unit;
91 	if (l.object_size)
92 		nl.object_size = l.object_size;
93 	else
94 		nl.object_size = ci->i_layout.object_size;
95 	if (l.data_pool)
96 		nl.data_pool = l.data_pool;
97 	else
98 		nl.data_pool = ci->i_layout.pool_id;
99 
100 	/* this is obsolete, and always -1 */
101 	nl.preferred_osd = -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_num_caps = 1;
114 
115 	req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
116 
117 	req->r_args.setlayout.layout.fl_stripe_unit =
118 		cpu_to_le32(l.stripe_unit);
119 	req->r_args.setlayout.layout.fl_stripe_count =
120 		cpu_to_le32(l.stripe_count);
121 	req->r_args.setlayout.layout.fl_object_size =
122 		cpu_to_le32(l.object_size);
123 	req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
124 
125 	err = ceph_mdsc_do_request(mdsc, NULL, req);
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  */
ceph_ioctl_set_layout_policy(struct file * file,void __user * arg)136 static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
137 {
138 	struct inode *inode = file_inode(file);
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 	req->r_num_caps = 1;
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  */
ceph_ioctl_get_dataloc(struct file * file,void __user * arg)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_inode(file);
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 	struct ceph_object_locator oloc;
187 	CEPH_DEFINE_OID_ONSTACK(oid);
188 	u32 xlen;
189 	u64 tmp;
190 	struct ceph_pg pgid;
191 	int r;
192 
193 	/* copy and validate */
194 	if (copy_from_user(&dl, arg, sizeof(dl)))
195 		return -EFAULT;
196 
197 	down_read(&osdc->lock);
198 	ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, 1,
199 				      &dl.object_no, &dl.object_offset, &xlen);
200 	dl.file_offset -= dl.object_offset;
201 	dl.object_size = ci->i_layout.object_size;
202 	dl.block_size = ci->i_layout.stripe_unit;
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 
211 	oloc.pool = ci->i_layout.pool_id;
212 	oloc.pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
213 	ceph_oid_printf(&oid, "%s", dl.object_name);
214 
215 	r = ceph_object_locator_to_pg(osdc->osdmap, &oid, &oloc, &pgid);
216 
217 	ceph_oloc_destroy(&oloc);
218 	if (r < 0) {
219 		up_read(&osdc->lock);
220 		return r;
221 	}
222 
223 	dl.osd = ceph_pg_to_acting_primary(osdc->osdmap, &pgid);
224 	if (dl.osd >= 0) {
225 		struct ceph_entity_addr *a =
226 			ceph_osd_addr(osdc->osdmap, dl.osd);
227 		if (a)
228 			memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
229 	} else {
230 		memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
231 	}
232 	up_read(&osdc->lock);
233 
234 	/* send result back to user */
235 	if (copy_to_user(arg, &dl, sizeof(dl)))
236 		return -EFAULT;
237 
238 	return 0;
239 }
240 
ceph_ioctl_lazyio(struct file * file)241 static long ceph_ioctl_lazyio(struct file *file)
242 {
243 	struct ceph_file_info *fi = file->private_data;
244 	struct inode *inode = file_inode(file);
245 	struct ceph_inode_info *ci = ceph_inode(inode);
246 
247 	if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
248 		spin_lock(&ci->i_ceph_lock);
249 		fi->fmode |= CEPH_FILE_MODE_LAZY;
250 		ci->i_nr_by_mode[ffs(CEPH_FILE_MODE_LAZY)]++;
251 		spin_unlock(&ci->i_ceph_lock);
252 		dout("ioctl_layzio: file %p marked lazy\n", file);
253 
254 		ceph_check_caps(ci, 0, NULL);
255 	} else {
256 		dout("ioctl_layzio: file %p already lazy\n", file);
257 	}
258 	return 0;
259 }
260 
ceph_ioctl_syncio(struct file * file)261 static long ceph_ioctl_syncio(struct file *file)
262 {
263 	struct ceph_file_info *fi = file->private_data;
264 
265 	fi->flags |= CEPH_F_SYNC;
266 	return 0;
267 }
268 
ceph_ioctl(struct file * file,unsigned int cmd,unsigned long arg)269 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
270 {
271 	dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
272 	switch (cmd) {
273 	case CEPH_IOC_GET_LAYOUT:
274 		return ceph_ioctl_get_layout(file, (void __user *)arg);
275 
276 	case CEPH_IOC_SET_LAYOUT:
277 		return ceph_ioctl_set_layout(file, (void __user *)arg);
278 
279 	case CEPH_IOC_SET_LAYOUT_POLICY:
280 		return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
281 
282 	case CEPH_IOC_GET_DATALOC:
283 		return ceph_ioctl_get_dataloc(file, (void __user *)arg);
284 
285 	case CEPH_IOC_LAZYIO:
286 		return ceph_ioctl_lazyio(file);
287 
288 	case CEPH_IOC_SYNCIO:
289 		return ceph_ioctl_syncio(file);
290 	}
291 
292 	return -ENOTTY;
293 }
294