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Linux/fs/coda/inode.c

  1 /*
  2  * Super block/filesystem wide operations
  3  *
  4  * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and 
  5  * Michael Callahan <callahan@maths.ox.ac.uk> 
  6  * 
  7  * Rewritten for Linux 2.1.  Peter Braam <braam@cs.cmu.edu>
  8  * Copyright (C) Carnegie Mellon University
  9  */
 10 
 11 #include <linux/module.h>
 12 #include <linux/kernel.h>
 13 #include <linux/mm.h>
 14 #include <linux/string.h>
 15 #include <linux/stat.h>
 16 #include <linux/errno.h>
 17 #include <linux/unistd.h>
 18 #include <linux/mutex.h>
 19 #include <linux/spinlock.h>
 20 #include <linux/file.h>
 21 #include <linux/vfs.h>
 22 #include <linux/slab.h>
 23 #include <linux/pid_namespace.h>
 24 
 25 #include <asm/uaccess.h>
 26 
 27 #include <linux/fs.h>
 28 #include <linux/vmalloc.h>
 29 
 30 #include <linux/coda.h>
 31 #include <linux/coda_psdev.h>
 32 #include "coda_linux.h"
 33 #include "coda_cache.h"
 34 
 35 #include "coda_int.h"
 36 
 37 /* VFS super_block ops */
 38 static void coda_evict_inode(struct inode *);
 39 static void coda_put_super(struct super_block *);
 40 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
 41 
 42 static struct kmem_cache * coda_inode_cachep;
 43 
 44 static struct inode *coda_alloc_inode(struct super_block *sb)
 45 {
 46         struct coda_inode_info *ei;
 47         ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
 48         if (!ei)
 49                 return NULL;
 50         memset(&ei->c_fid, 0, sizeof(struct CodaFid));
 51         ei->c_flags = 0;
 52         ei->c_uid = GLOBAL_ROOT_UID;
 53         ei->c_cached_perm = 0;
 54         spin_lock_init(&ei->c_lock);
 55         return &ei->vfs_inode;
 56 }
 57 
 58 static void coda_i_callback(struct rcu_head *head)
 59 {
 60         struct inode *inode = container_of(head, struct inode, i_rcu);
 61         kmem_cache_free(coda_inode_cachep, ITOC(inode));
 62 }
 63 
 64 static void coda_destroy_inode(struct inode *inode)
 65 {
 66         call_rcu(&inode->i_rcu, coda_i_callback);
 67 }
 68 
 69 static void init_once(void *foo)
 70 {
 71         struct coda_inode_info *ei = (struct coda_inode_info *) foo;
 72 
 73         inode_init_once(&ei->vfs_inode);
 74 }
 75 
 76 int __init coda_init_inodecache(void)
 77 {
 78         coda_inode_cachep = kmem_cache_create("coda_inode_cache",
 79                                 sizeof(struct coda_inode_info),
 80                                 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 81                                 init_once);
 82         if (coda_inode_cachep == NULL)
 83                 return -ENOMEM;
 84         return 0;
 85 }
 86 
 87 void coda_destroy_inodecache(void)
 88 {
 89         /*
 90          * Make sure all delayed rcu free inodes are flushed before we
 91          * destroy cache.
 92          */
 93         rcu_barrier();
 94         kmem_cache_destroy(coda_inode_cachep);
 95 }
 96 
 97 static int coda_remount(struct super_block *sb, int *flags, char *data)
 98 {
 99         sync_filesystem(sb);
100         *flags |= MS_NOATIME;
101         return 0;
102 }
103 
104 /* exported operations */
105 static const struct super_operations coda_super_operations =
106 {
107         .alloc_inode    = coda_alloc_inode,
108         .destroy_inode  = coda_destroy_inode,
109         .evict_inode    = coda_evict_inode,
110         .put_super      = coda_put_super,
111         .statfs         = coda_statfs,
112         .remount_fs     = coda_remount,
113 };
114 
115 static int get_device_index(struct coda_mount_data *data)
116 {
117         struct fd f;
118         struct inode *inode;
119         int idx;
120 
121         if (data == NULL) {
122                 pr_warn("%s: Bad mount data\n", __func__);
123                 return -1;
124         }
125 
126         if (data->version != CODA_MOUNT_VERSION) {
127                 pr_warn("%s: Bad mount version\n", __func__);
128                 return -1;
129         }
130 
131         f = fdget(data->fd);
132         if (!f.file)
133                 goto Ebadf;
134         inode = file_inode(f.file);
135         if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
136                 fdput(f);
137                 goto Ebadf;
138         }
139 
140         idx = iminor(inode);
141         fdput(f);
142 
143         if (idx < 0 || idx >= MAX_CODADEVS) {
144                 pr_warn("%s: Bad minor number\n", __func__);
145                 return -1;
146         }
147 
148         return idx;
149 Ebadf:
150         pr_warn("%s: Bad file\n", __func__);
151         return -1;
152 }
153 
154 static int coda_fill_super(struct super_block *sb, void *data, int silent)
155 {
156         struct inode *root = NULL;
157         struct venus_comm *vc;
158         struct CodaFid fid;
159         int error;
160         int idx;
161 
162         if (task_active_pid_ns(current) != &init_pid_ns)
163                 return -EINVAL;
164 
165         idx = get_device_index((struct coda_mount_data *) data);
166 
167         /* Ignore errors in data, for backward compatibility */
168         if(idx == -1)
169                 idx = 0;
170         
171         pr_info("%s: device index: %i\n", __func__,  idx);
172 
173         vc = &coda_comms[idx];
174         mutex_lock(&vc->vc_mutex);
175 
176         if (!vc->vc_inuse) {
177                 pr_warn("%s: No pseudo device\n", __func__);
178                 error = -EINVAL;
179                 goto unlock_out;
180         }
181 
182         if (vc->vc_sb) {
183                 pr_warn("%s: Device already mounted\n", __func__);
184                 error = -EBUSY;
185                 goto unlock_out;
186         }
187 
188         error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
189         if (error)
190                 goto unlock_out;
191 
192         vc->vc_sb = sb;
193         mutex_unlock(&vc->vc_mutex);
194 
195         sb->s_fs_info = vc;
196         sb->s_flags |= MS_NOATIME;
197         sb->s_blocksize = 4096; /* XXXXX  what do we put here?? */
198         sb->s_blocksize_bits = 12;
199         sb->s_magic = CODA_SUPER_MAGIC;
200         sb->s_op = &coda_super_operations;
201         sb->s_d_op = &coda_dentry_operations;
202         sb->s_bdi = &vc->bdi;
203 
204         /* get root fid from Venus: this needs the root inode */
205         error = venus_rootfid(sb, &fid);
206         if ( error ) {
207                 pr_warn("%s: coda_get_rootfid failed with %d\n",
208                         __func__, error);
209                 goto error;
210         }
211         pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid));
212         
213         /* make root inode */
214         root = coda_cnode_make(&fid, sb);
215         if (IS_ERR(root)) {
216                 error = PTR_ERR(root);
217                 pr_warn("Failure of coda_cnode_make for root: error %d\n",
218                         error);
219                 goto error;
220         } 
221 
222         pr_info("%s: rootinode is %ld dev %s\n",
223                 __func__, root->i_ino, root->i_sb->s_id);
224         sb->s_root = d_make_root(root);
225         if (!sb->s_root) {
226                 error = -EINVAL;
227                 goto error;
228         }
229         return 0;
230 
231 error:
232         mutex_lock(&vc->vc_mutex);
233         bdi_destroy(&vc->bdi);
234         vc->vc_sb = NULL;
235         sb->s_fs_info = NULL;
236 unlock_out:
237         mutex_unlock(&vc->vc_mutex);
238         return error;
239 }
240 
241 static void coda_put_super(struct super_block *sb)
242 {
243         struct venus_comm *vcp = coda_vcp(sb);
244         mutex_lock(&vcp->vc_mutex);
245         bdi_destroy(&vcp->bdi);
246         vcp->vc_sb = NULL;
247         sb->s_fs_info = NULL;
248         mutex_unlock(&vcp->vc_mutex);
249 
250         pr_info("Bye bye.\n");
251 }
252 
253 static void coda_evict_inode(struct inode *inode)
254 {
255         truncate_inode_pages_final(&inode->i_data);
256         clear_inode(inode);
257         coda_cache_clear_inode(inode);
258 }
259 
260 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
261 {
262         int err = coda_revalidate_inode(dentry->d_inode);
263         if (!err)
264                 generic_fillattr(dentry->d_inode, stat);
265         return err;
266 }
267 
268 int coda_setattr(struct dentry *de, struct iattr *iattr)
269 {
270         struct inode *inode = de->d_inode;
271         struct coda_vattr vattr;
272         int error;
273 
274         memset(&vattr, 0, sizeof(vattr)); 
275 
276         inode->i_ctime = CURRENT_TIME_SEC;
277         coda_iattr_to_vattr(iattr, &vattr);
278         vattr.va_type = C_VNON; /* cannot set type */
279 
280         /* Venus is responsible for truncating the container-file!!! */
281         error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
282 
283         if (!error) {
284                 coda_vattr_to_iattr(inode, &vattr); 
285                 coda_cache_clear_inode(inode);
286         }
287         return error;
288 }
289 
290 const struct inode_operations coda_file_inode_operations = {
291         .permission     = coda_permission,
292         .getattr        = coda_getattr,
293         .setattr        = coda_setattr,
294 };
295 
296 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
297 {
298         int error;
299         
300         error = venus_statfs(dentry, buf);
301 
302         if (error) {
303                 /* fake something like AFS does */
304                 buf->f_blocks = 9000000;
305                 buf->f_bfree  = 9000000;
306                 buf->f_bavail = 9000000;
307                 buf->f_files  = 9000000;
308                 buf->f_ffree  = 9000000;
309         }
310 
311         /* and fill in the rest */
312         buf->f_type = CODA_SUPER_MAGIC;
313         buf->f_bsize = 4096;
314         buf->f_namelen = CODA_MAXNAMLEN;
315 
316         return 0; 
317 }
318 
319 /* init_coda: used by filesystems.c to register coda */
320 
321 static struct dentry *coda_mount(struct file_system_type *fs_type,
322         int flags, const char *dev_name, void *data)
323 {
324         return mount_nodev(fs_type, flags, data, coda_fill_super);
325 }
326 
327 struct file_system_type coda_fs_type = {
328         .owner          = THIS_MODULE,
329         .name           = "coda",
330         .mount          = coda_mount,
331         .kill_sb        = kill_anon_super,
332         .fs_flags       = FS_BINARY_MOUNTDATA,
333 };
334 MODULE_ALIAS_FS("coda");
335 
336 

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