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

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