inode.c 7.0 KB

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  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. #include <linux/module.h>
  11. #include <linux/kernel.h>
  12. #include <linux/mm.h>
  13. #include <linux/string.h>
  14. #include <linux/stat.h>
  15. #include <linux/errno.h>
  16. #include <linux/unistd.h>
  17. #include <linux/smp_lock.h>
  18. #include <linux/file.h>
  19. #include <linux/vfs.h>
  20. #include <asm/system.h>
  21. #include <asm/uaccess.h>
  22. #include <linux/fs.h>
  23. #include <linux/vmalloc.h>
  24. #include <linux/coda.h>
  25. #include <linux/coda_linux.h>
  26. #include <linux/coda_psdev.h>
  27. #include <linux/coda_fs_i.h>
  28. #include <linux/coda_cache.h>
  29. #include "coda_int.h"
  30. /* VFS super_block ops */
  31. static void coda_clear_inode(struct inode *);
  32. static void coda_put_super(struct super_block *);
  33. static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
  34. static struct kmem_cache * coda_inode_cachep;
  35. static struct inode *coda_alloc_inode(struct super_block *sb)
  36. {
  37. struct coda_inode_info *ei;
  38. ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
  39. if (!ei)
  40. return NULL;
  41. memset(&ei->c_fid, 0, sizeof(struct CodaFid));
  42. ei->c_flags = 0;
  43. ei->c_uid = 0;
  44. ei->c_cached_perm = 0;
  45. return &ei->vfs_inode;
  46. }
  47. static void coda_destroy_inode(struct inode *inode)
  48. {
  49. kmem_cache_free(coda_inode_cachep, ITOC(inode));
  50. }
  51. static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
  52. {
  53. struct coda_inode_info *ei = (struct coda_inode_info *) foo;
  54. if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  55. SLAB_CTOR_CONSTRUCTOR)
  56. inode_init_once(&ei->vfs_inode);
  57. }
  58. int coda_init_inodecache(void)
  59. {
  60. coda_inode_cachep = kmem_cache_create("coda_inode_cache",
  61. sizeof(struct coda_inode_info),
  62. 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
  63. init_once, NULL);
  64. if (coda_inode_cachep == NULL)
  65. return -ENOMEM;
  66. return 0;
  67. }
  68. void coda_destroy_inodecache(void)
  69. {
  70. kmem_cache_destroy(coda_inode_cachep);
  71. }
  72. static int coda_remount(struct super_block *sb, int *flags, char *data)
  73. {
  74. *flags |= MS_NODIRATIME;
  75. return 0;
  76. }
  77. /* exported operations */
  78. static const struct super_operations coda_super_operations =
  79. {
  80. .alloc_inode = coda_alloc_inode,
  81. .destroy_inode = coda_destroy_inode,
  82. .clear_inode = coda_clear_inode,
  83. .put_super = coda_put_super,
  84. .statfs = coda_statfs,
  85. .remount_fs = coda_remount,
  86. };
  87. static int get_device_index(struct coda_mount_data *data)
  88. {
  89. struct file *file;
  90. struct inode *inode;
  91. int idx;
  92. if(data == NULL) {
  93. printk("coda_read_super: Bad mount data\n");
  94. return -1;
  95. }
  96. if(data->version != CODA_MOUNT_VERSION) {
  97. printk("coda_read_super: Bad mount version\n");
  98. return -1;
  99. }
  100. file = fget(data->fd);
  101. inode = NULL;
  102. if(file)
  103. inode = file->f_path.dentry->d_inode;
  104. if(!inode || !S_ISCHR(inode->i_mode) ||
  105. imajor(inode) != CODA_PSDEV_MAJOR) {
  106. if(file)
  107. fput(file);
  108. printk("coda_read_super: Bad file\n");
  109. return -1;
  110. }
  111. idx = iminor(inode);
  112. fput(file);
  113. if(idx < 0 || idx >= MAX_CODADEVS) {
  114. printk("coda_read_super: Bad minor number\n");
  115. return -1;
  116. }
  117. return idx;
  118. }
  119. static int coda_fill_super(struct super_block *sb, void *data, int silent)
  120. {
  121. struct inode *root = NULL;
  122. struct coda_sb_info *sbi = NULL;
  123. struct venus_comm *vc = NULL;
  124. struct CodaFid fid;
  125. int error;
  126. int idx;
  127. idx = get_device_index((struct coda_mount_data *) data);
  128. /* Ignore errors in data, for backward compatibility */
  129. if(idx == -1)
  130. idx = 0;
  131. printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
  132. vc = &coda_comms[idx];
  133. if (!vc->vc_inuse) {
  134. printk("coda_read_super: No pseudo device\n");
  135. return -EINVAL;
  136. }
  137. if ( vc->vc_sb ) {
  138. printk("coda_read_super: Device already mounted\n");
  139. return -EBUSY;
  140. }
  141. sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
  142. if(!sbi) {
  143. return -ENOMEM;
  144. }
  145. vc->vc_sb = sb;
  146. sbi->sbi_vcomm = vc;
  147. sb->s_fs_info = sbi;
  148. sb->s_flags |= MS_NODIRATIME; /* probably even noatime */
  149. sb->s_blocksize = 1024; /* XXXXX what do we put here?? */
  150. sb->s_blocksize_bits = 10;
  151. sb->s_magic = CODA_SUPER_MAGIC;
  152. sb->s_op = &coda_super_operations;
  153. /* get root fid from Venus: this needs the root inode */
  154. error = venus_rootfid(sb, &fid);
  155. if ( error ) {
  156. printk("coda_read_super: coda_get_rootfid failed with %d\n",
  157. error);
  158. goto error;
  159. }
  160. printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
  161. /* make root inode */
  162. error = coda_cnode_make(&root, &fid, sb);
  163. if ( error || !root ) {
  164. printk("Failure of coda_cnode_make for root: error %d\n", error);
  165. goto error;
  166. }
  167. printk("coda_read_super: rootinode is %ld dev %s\n",
  168. root->i_ino, root->i_sb->s_id);
  169. sb->s_root = d_alloc_root(root);
  170. if (!sb->s_root)
  171. goto error;
  172. return 0;
  173. error:
  174. if (sbi) {
  175. kfree(sbi);
  176. if(vc)
  177. vc->vc_sb = NULL;
  178. }
  179. if (root)
  180. iput(root);
  181. return -EINVAL;
  182. }
  183. static void coda_put_super(struct super_block *sb)
  184. {
  185. struct coda_sb_info *sbi;
  186. sbi = coda_sbp(sb);
  187. sbi->sbi_vcomm->vc_sb = NULL;
  188. printk("Coda: Bye bye.\n");
  189. kfree(sbi);
  190. }
  191. static void coda_clear_inode(struct inode *inode)
  192. {
  193. coda_cache_clear_inode(inode);
  194. }
  195. int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
  196. {
  197. int err = coda_revalidate_inode(dentry);
  198. if (!err)
  199. generic_fillattr(dentry->d_inode, stat);
  200. return err;
  201. }
  202. int coda_setattr(struct dentry *de, struct iattr *iattr)
  203. {
  204. struct inode *inode = de->d_inode;
  205. struct coda_vattr vattr;
  206. int error;
  207. lock_kernel();
  208. memset(&vattr, 0, sizeof(vattr));
  209. inode->i_ctime = CURRENT_TIME_SEC;
  210. coda_iattr_to_vattr(iattr, &vattr);
  211. vattr.va_type = C_VNON; /* cannot set type */
  212. /* Venus is responsible for truncating the container-file!!! */
  213. error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
  214. if ( !error ) {
  215. coda_vattr_to_iattr(inode, &vattr);
  216. coda_cache_clear_inode(inode);
  217. }
  218. unlock_kernel();
  219. return error;
  220. }
  221. const struct inode_operations coda_file_inode_operations = {
  222. .permission = coda_permission,
  223. .getattr = coda_getattr,
  224. .setattr = coda_setattr,
  225. };
  226. static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
  227. {
  228. int error;
  229. lock_kernel();
  230. error = venus_statfs(dentry, buf);
  231. unlock_kernel();
  232. if (error) {
  233. /* fake something like AFS does */
  234. buf->f_blocks = 9000000;
  235. buf->f_bfree = 9000000;
  236. buf->f_bavail = 9000000;
  237. buf->f_files = 9000000;
  238. buf->f_ffree = 9000000;
  239. }
  240. /* and fill in the rest */
  241. buf->f_type = CODA_SUPER_MAGIC;
  242. buf->f_bsize = 1024;
  243. buf->f_namelen = CODA_MAXNAMLEN;
  244. return 0;
  245. }
  246. /* init_coda: used by filesystems.c to register coda */
  247. static int coda_get_sb(struct file_system_type *fs_type,
  248. int flags, const char *dev_name, void *data, struct vfsmount *mnt)
  249. {
  250. return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
  251. }
  252. struct file_system_type coda_fs_type = {
  253. .owner = THIS_MODULE,
  254. .name = "coda",
  255. .get_sb = coda_get_sb,
  256. .kill_sb = kill_anon_super,
  257. .fs_flags = FS_BINARY_MOUNTDATA,
  258. };