BKL: remove BKL from freevxfs
[pandora-kernel.git] / fs / ceph / ioctl.c
1 #include <linux/in.h>
2
3 #include "ioctl.h"
4 #include "super.h"
5 #include "ceph_debug.h"
6
7
8 /*
9  * ioctls
10  */
11
12 /*
13  * get and set the file layout
14  */
15 static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
16 {
17         struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
18         struct ceph_ioctl_layout l;
19         int err;
20
21         err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
22         if (!err) {
23                 l.stripe_unit = ceph_file_layout_su(ci->i_layout);
24                 l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
25                 l.object_size = ceph_file_layout_object_size(ci->i_layout);
26                 l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
27                 l.preferred_osd =
28                         (s32)le32_to_cpu(ci->i_layout.fl_pg_preferred);
29                 if (copy_to_user(arg, &l, sizeof(l)))
30                         return -EFAULT;
31         }
32
33         return err;
34 }
35
36 static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
37 {
38         struct inode *inode = file->f_dentry->d_inode;
39         struct inode *parent_inode = file->f_dentry->d_parent->d_inode;
40         struct ceph_mds_client *mdsc = &ceph_sb_to_client(inode->i_sb)->mdsc;
41         struct ceph_mds_request *req;
42         struct ceph_ioctl_layout l;
43         int err, i;
44
45         /* copy and validate */
46         if (copy_from_user(&l, arg, sizeof(l)))
47                 return -EFAULT;
48
49         if ((l.object_size & ~PAGE_MASK) ||
50             (l.stripe_unit & ~PAGE_MASK) ||
51             !l.stripe_unit ||
52             (l.object_size &&
53              (unsigned)l.object_size % (unsigned)l.stripe_unit))
54                 return -EINVAL;
55
56         /* make sure it's a valid data pool */
57         if (l.data_pool > 0) {
58                 mutex_lock(&mdsc->mutex);
59                 err = -EINVAL;
60                 for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
61                         if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
62                                 err = 0;
63                                 break;
64                         }
65                 mutex_unlock(&mdsc->mutex);
66                 if (err)
67                         return err;
68         }
69
70         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
71                                        USE_AUTH_MDS);
72         if (IS_ERR(req))
73                 return PTR_ERR(req);
74         req->r_inode = igrab(inode);
75         req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
76
77         req->r_args.setlayout.layout.fl_stripe_unit =
78                 cpu_to_le32(l.stripe_unit);
79         req->r_args.setlayout.layout.fl_stripe_count =
80                 cpu_to_le32(l.stripe_count);
81         req->r_args.setlayout.layout.fl_object_size =
82                 cpu_to_le32(l.object_size);
83         req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
84         req->r_args.setlayout.layout.fl_pg_preferred =
85                 cpu_to_le32(l.preferred_osd);
86
87         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
88         ceph_mdsc_put_request(req);
89         return err;
90 }
91
92 /*
93  * Return object name, size/offset information, and location (OSD
94  * number, network address) for a given file offset.
95  */
96 static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
97 {
98         struct ceph_ioctl_dataloc dl;
99         struct inode *inode = file->f_dentry->d_inode;
100         struct ceph_inode_info *ci = ceph_inode(inode);
101         struct ceph_osd_client *osdc = &ceph_sb_to_client(inode->i_sb)->osdc;
102         u64 len = 1, olen;
103         u64 tmp;
104         struct ceph_object_layout ol;
105         struct ceph_pg pgid;
106
107         /* copy and validate */
108         if (copy_from_user(&dl, arg, sizeof(dl)))
109                 return -EFAULT;
110
111         down_read(&osdc->map_sem);
112         ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
113                                       &dl.object_no, &dl.object_offset, &olen);
114         dl.file_offset -= dl.object_offset;
115         dl.object_size = ceph_file_layout_object_size(ci->i_layout);
116         dl.block_size = ceph_file_layout_su(ci->i_layout);
117
118         /* block_offset = object_offset % block_size */
119         tmp = dl.object_offset;
120         dl.block_offset = do_div(tmp, dl.block_size);
121
122         snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
123                  ceph_ino(inode), dl.object_no);
124         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
125                                 osdc->osdmap);
126
127         pgid = ol.ol_pgid;
128         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
129         if (dl.osd >= 0) {
130                 struct ceph_entity_addr *a =
131                         ceph_osd_addr(osdc->osdmap, dl.osd);
132                 if (a)
133                         memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
134         } else {
135                 memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
136         }
137         up_read(&osdc->map_sem);
138
139         /* send result back to user */
140         if (copy_to_user(arg, &dl, sizeof(dl)))
141                 return -EFAULT;
142
143         return 0;
144 }
145
146 static long ceph_ioctl_lazyio(struct file *file)
147 {
148         struct ceph_file_info *fi = file->private_data;
149         struct inode *inode = file->f_dentry->d_inode;
150         struct ceph_inode_info *ci = ceph_inode(inode);
151
152         if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
153                 spin_lock(&inode->i_lock);
154                 ci->i_nr_by_mode[fi->fmode]--;
155                 fi->fmode |= CEPH_FILE_MODE_LAZY;
156                 ci->i_nr_by_mode[fi->fmode]++;
157                 spin_unlock(&inode->i_lock);
158                 dout("ioctl_layzio: file %p marked lazy\n", file);
159
160                 ceph_check_caps(ci, 0, NULL);
161         } else {
162                 dout("ioctl_layzio: file %p already lazy\n", file);
163         }
164         return 0;
165 }
166
167 long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
168 {
169         dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
170         switch (cmd) {
171         case CEPH_IOC_GET_LAYOUT:
172                 return ceph_ioctl_get_layout(file, (void __user *)arg);
173
174         case CEPH_IOC_SET_LAYOUT:
175                 return ceph_ioctl_set_layout(file, (void __user *)arg);
176
177         case CEPH_IOC_GET_DATALOC:
178                 return ceph_ioctl_get_dataloc(file, (void __user *)arg);
179
180         case CEPH_IOC_LAZYIO:
181                 return ceph_ioctl_lazyio(file);
182         }
183         return -ENOTTY;
184 }