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Linux/fs/coda/inode.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Super block/filesystem wide operations
  4  *
  5  * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and 
  6  * Michael Callahan <callahan@maths.ox.ac.uk> 
  7  * 
  8  * Rewritten for Linux 2.1.  Peter Braam <braam@cs.cmu.edu>
  9  * Copyright (C) Carnegie Mellon University
 10  */
 11 
 12 #include <linux/module.h>
 13 #include <linux/kernel.h>
 14 #include <linux/mm.h>
 15 #include <linux/string.h>
 16 #include <linux/stat.h>
 17 #include <linux/errno.h>
 18 #include <linux/unistd.h>
 19 #include <linux/mutex.h>
 20 #include <linux/spinlock.h>
 21 #include <linux/file.h>
 22 #include <linux/vfs.h>
 23 #include <linux/slab.h>
 24 #include <linux/pid_namespace.h>
 25 #include <linux/uaccess.h>
 26 #include <linux/fs.h>
 27 #include <linux/vmalloc.h>
 28 
 29 #include <linux/coda.h>
 30 #include <linux/coda_psdev.h>
 31 #include "coda_linux.h"
 32 #include "coda_cache.h"
 33 
 34 #include "coda_int.h"
 35 
 36 /* VFS super_block ops */
 37 static void coda_evict_inode(struct inode *);
 38 static void coda_put_super(struct super_block *);
 39 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
 40 
 41 static struct kmem_cache * coda_inode_cachep;
 42 
 43 static struct inode *coda_alloc_inode(struct super_block *sb)
 44 {
 45         struct coda_inode_info *ei;
 46         ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
 47         if (!ei)
 48                 return NULL;
 49         memset(&ei->c_fid, 0, sizeof(struct CodaFid));
 50         ei->c_flags = 0;
 51         ei->c_uid = GLOBAL_ROOT_UID;
 52         ei->c_cached_perm = 0;
 53         spin_lock_init(&ei->c_lock);
 54         return &ei->vfs_inode;
 55 }
 56 
 57 static void coda_i_callback(struct rcu_head *head)
 58 {
 59         struct inode *inode = container_of(head, struct inode, i_rcu);
 60         kmem_cache_free(coda_inode_cachep, ITOC(inode));
 61 }
 62 
 63 static void coda_destroy_inode(struct inode *inode)
 64 {
 65         call_rcu(&inode->i_rcu, coda_i_callback);
 66 }
 67 
 68 static void init_once(void *foo)
 69 {
 70         struct coda_inode_info *ei = (struct coda_inode_info *) foo;
 71 
 72         inode_init_once(&ei->vfs_inode);
 73 }
 74 
 75 int __init coda_init_inodecache(void)
 76 {
 77         coda_inode_cachep = kmem_cache_create("coda_inode_cache",
 78                                 sizeof(struct coda_inode_info), 0,
 79                                 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 80                                 SLAB_ACCOUNT, init_once);
 81         if (coda_inode_cachep == NULL)
 82                 return -ENOMEM;
 83         return 0;
 84 }
 85 
 86 void coda_destroy_inodecache(void)
 87 {
 88         /*
 89          * Make sure all delayed rcu free inodes are flushed before we
 90          * destroy cache.
 91          */
 92         rcu_barrier();
 93         kmem_cache_destroy(coda_inode_cachep);
 94 }
 95 
 96 static int coda_remount(struct super_block *sb, int *flags, char *data)
 97 {
 98         sync_filesystem(sb);
 99         *flags |= SB_NOATIME;
100         return 0;
101 }
102 
103 /* exported operations */
104 static const struct super_operations coda_super_operations =
105 {
106         .alloc_inode    = coda_alloc_inode,
107         .destroy_inode  = coda_destroy_inode,
108         .evict_inode    = coda_evict_inode,
109         .put_super      = coda_put_super,
110         .statfs         = coda_statfs,
111         .remount_fs     = coda_remount,
112 };
113 
114 static int get_device_index(struct coda_mount_data *data)
115 {
116         struct fd f;
117         struct inode *inode;
118         int idx;
119 
120         if (data == NULL) {
121                 pr_warn("%s: Bad mount data\n", __func__);
122                 return -1;
123         }
124 
125         if (data->version != CODA_MOUNT_VERSION) {
126                 pr_warn("%s: Bad mount version\n", __func__);
127                 return -1;
128         }
129 
130         f = fdget(data->fd);
131         if (!f.file)
132                 goto Ebadf;
133         inode = file_inode(f.file);
134         if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
135                 fdput(f);
136                 goto Ebadf;
137         }
138 
139         idx = iminor(inode);
140         fdput(f);
141 
142         if (idx < 0 || idx >= MAX_CODADEVS) {
143                 pr_warn("%s: Bad minor number\n", __func__);
144                 return -1;
145         }
146 
147         return idx;
148 Ebadf:
149         pr_warn("%s: Bad file\n", __func__);
150         return -1;
151 }
152 
153 static int coda_fill_super(struct super_block *sb, void *data, int silent)
154 {
155         struct inode *root = NULL;
156         struct venus_comm *vc;
157         struct CodaFid fid;
158         int error;
159         int idx;
160 
161         if (task_active_pid_ns(current) != &init_pid_ns)
162                 return -EINVAL;
163 
164         idx = get_device_index((struct coda_mount_data *) data);
165 
166         /* Ignore errors in data, for backward compatibility */
167         if(idx == -1)
168                 idx = 0;
169         
170         pr_info("%s: device index: %i\n", __func__,  idx);
171 
172         vc = &coda_comms[idx];
173         mutex_lock(&vc->vc_mutex);
174 
175         if (!vc->vc_inuse) {
176                 pr_warn("%s: No pseudo device\n", __func__);
177                 error = -EINVAL;
178                 goto unlock_out;
179         }
180 
181         if (vc->vc_sb) {
182                 pr_warn("%s: Device already mounted\n", __func__);
183                 error = -EBUSY;
184                 goto unlock_out;
185         }
186 
187         vc->vc_sb = sb;
188         mutex_unlock(&vc->vc_mutex);
189 
190         sb->s_fs_info = vc;
191         sb->s_flags |= SB_NOATIME;
192         sb->s_blocksize = 4096; /* XXXXX  what do we put here?? */
193         sb->s_blocksize_bits = 12;
194         sb->s_magic = CODA_SUPER_MAGIC;
195         sb->s_op = &coda_super_operations;
196         sb->s_d_op = &coda_dentry_operations;
197 
198         error = super_setup_bdi(sb);
199         if (error)
200                 goto error;
201 
202         /* get root fid from Venus: this needs the root inode */
203         error = venus_rootfid(sb, &fid);
204         if ( error ) {
205                 pr_warn("%s: coda_get_rootfid failed with %d\n",
206                         __func__, error);
207                 goto error;
208         }
209         pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid));
210         
211         /* make root inode */
212         root = coda_cnode_make(&fid, sb);
213         if (IS_ERR(root)) {
214                 error = PTR_ERR(root);
215                 pr_warn("Failure of coda_cnode_make for root: error %d\n",
216                         error);
217                 goto error;
218         } 
219 
220         pr_info("%s: rootinode is %ld dev %s\n",
221                 __func__, root->i_ino, root->i_sb->s_id);
222         sb->s_root = d_make_root(root);
223         if (!sb->s_root) {
224                 error = -EINVAL;
225                 goto error;
226         }
227         return 0;
228 
229 error:
230         mutex_lock(&vc->vc_mutex);
231         vc->vc_sb = NULL;
232         sb->s_fs_info = NULL;
233 unlock_out:
234         mutex_unlock(&vc->vc_mutex);
235         return error;
236 }
237 
238 static void coda_put_super(struct super_block *sb)
239 {
240         struct venus_comm *vcp = coda_vcp(sb);
241         mutex_lock(&vcp->vc_mutex);
242         vcp->vc_sb = NULL;
243         sb->s_fs_info = NULL;
244         mutex_unlock(&vcp->vc_mutex);
245 
246         pr_info("Bye bye.\n");
247 }
248 
249 static void coda_evict_inode(struct inode *inode)
250 {
251         truncate_inode_pages_final(&inode->i_data);
252         clear_inode(inode);
253         coda_cache_clear_inode(inode);
254 }
255 
256 int coda_getattr(const struct path *path, struct kstat *stat,
257                  u32 request_mask, unsigned int flags)
258 {
259         int err = coda_revalidate_inode(d_inode(path->dentry));
260         if (!err)
261                 generic_fillattr(d_inode(path->dentry), stat);
262         return err;
263 }
264 
265 int coda_setattr(struct dentry *de, struct iattr *iattr)
266 {
267         struct inode *inode = d_inode(de);
268         struct coda_vattr vattr;
269         int error;
270 
271         memset(&vattr, 0, sizeof(vattr)); 
272 
273         inode->i_ctime = current_time(inode);
274         coda_iattr_to_vattr(iattr, &vattr);
275         vattr.va_type = C_VNON; /* cannot set type */
276 
277         /* Venus is responsible for truncating the container-file!!! */
278         error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
279 
280         if (!error) {
281                 coda_vattr_to_iattr(inode, &vattr); 
282                 coda_cache_clear_inode(inode);
283         }
284         return error;
285 }
286 
287 const struct inode_operations coda_file_inode_operations = {
288         .permission     = coda_permission,
289         .getattr        = coda_getattr,
290         .setattr        = coda_setattr,
291 };
292 
293 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
294 {
295         int error;
296         
297         error = venus_statfs(dentry, buf);
298 
299         if (error) {
300                 /* fake something like AFS does */
301                 buf->f_blocks = 9000000;
302                 buf->f_bfree  = 9000000;
303                 buf->f_bavail = 9000000;
304                 buf->f_files  = 9000000;
305                 buf->f_ffree  = 9000000;
306         }
307 
308         /* and fill in the rest */
309         buf->f_type = CODA_SUPER_MAGIC;
310         buf->f_bsize = 4096;
311         buf->f_namelen = CODA_MAXNAMLEN;
312 
313         return 0; 
314 }
315 
316 /* init_coda: used by filesystems.c to register coda */
317 
318 static struct dentry *coda_mount(struct file_system_type *fs_type,
319         int flags, const char *dev_name, void *data)
320 {
321         return mount_nodev(fs_type, flags, data, coda_fill_super);
322 }
323 
324 struct file_system_type coda_fs_type = {
325         .owner          = THIS_MODULE,
326         .name           = "coda",
327         .mount          = coda_mount,
328         .kill_sb        = kill_anon_super,
329         .fs_flags       = FS_BINARY_MOUNTDATA,
330 };
331 MODULE_ALIAS_FS("coda");
332 
333 

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