2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * VFS operations for Linux
13 * super_block operations should return negated errno to Linux.
15 #include <afsconfig.h>
16 #include "afs/param.h"
19 #define __NO_VERSION__ /* don't define kernel_version in module.h */
20 #include <linux/module.h> /* early to avoid printf->printk mapping */
21 #include "afs/sysincludes.h"
22 #include "afsincludes.h"
23 #include "afs/afs_stats.h"
25 #include "osi_compat.h"
27 struct vcache *afs_globalVp = 0;
28 struct vfs *afs_globalVFS = 0;
29 struct vfsmount *afs_cacheMnt;
30 int afs_was_mounted = 0; /* Used to force reload if mount/unmount/mount */
32 extern struct super_operations afs_sops;
33 #if !defined(AFS_NONFSTRANS)
34 extern struct export_operations afs_export_ops;
36 extern afs_rwlock_t afs_xvcache;
37 extern struct afs_q VLRU;
39 extern struct dentry_operations afs_dentry_operations;
41 /* Forward declarations */
42 static int afs_root(struct super_block *afsp);
43 int afs_fill_super(struct super_block *sb, void *data, int silent);
47 * afs_mount (2.6.37+) and afs_get_sb (2.6.36-) are the entry
48 * points from the vfs when mounting afs. The super block
49 * structure is setup in the afs_fill_super callback function.
52 #if defined(STRUCT_FILE_SYSTEM_TYPE_HAS_MOUNT)
53 static struct dentry *
54 afs_mount(struct file_system_type *fs_type, int flags,
55 const char *dev_name, void *data) {
56 return mount_nodev(fs_type, flags, data, afs_fill_super);
58 #elif defined(GET_SB_HAS_STRUCT_VFSMOUNT)
60 afs_get_sb(struct file_system_type *fs_type, int flags,
61 const char *dev_name, void *data, struct vfsmount *mnt) {
62 return get_sb_nodev(fs_type, flags, data, afs_fill_super, mnt);
65 static struct super_block *
66 afs_get_sb(struct file_system_type *fs_type, int flags,
67 const char *dev_name, void *data) {
68 return get_sb_nodev(fs_type, flags, data, afs_fill_super);
72 struct file_system_type afs_fs_type = {
75 #if defined(STRUCT_FILE_SYSTEM_TYPE_HAS_MOUNT)
80 .kill_sb = kill_anon_super,
81 .fs_flags = FS_BINARY_MOUNTDATA,
84 struct backing_dev_info *afs_backing_dev_info;
87 afs_fill_super(struct super_block *sb, void *data, int silent)
90 #if defined(HAVE_LINUX_BDI_INIT)
91 int bdi_init_done = 0;
95 if (afs_was_mounted) {
97 ("You must reload the AFS kernel extensions before remounting AFS.\n");
103 /* Set basics of super_block */
104 __module_get(THIS_MODULE);
107 sb->s_flags |= MS_NOATIME;
108 sb->s_blocksize = 1024;
109 sb->s_blocksize_bits = 10;
110 sb->s_magic = AFS_VFSMAGIC;
111 sb->s_op = &afs_sops; /* Super block (vfs) ops */
113 #if defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
114 sb->s_d_op = &afs_dentry_operations;
117 /* used for inodes backing_dev_info field, also */
118 afs_backing_dev_info = kzalloc(sizeof(struct backing_dev_info), GFP_NOFS);
119 #if defined(HAVE_LINUX_BDI_INIT)
120 code = bdi_init(afs_backing_dev_info);
125 #if defined(STRUCT_BACKING_DEV_INFO_HAS_NAME)
126 afs_backing_dev_info->name = "openafs";
128 afs_backing_dev_info->ra_pages = 32;
129 #if defined (STRUCT_SUPER_BLOCK_HAS_S_BDI)
130 sb->s_bdi = afs_backing_dev_info;
131 /* The name specified here will appear in the flushing thread name - flush-afs */
132 bdi_register(afs_backing_dev_info, NULL, "afs");
134 #if !defined(AFS_NONFSTRANS)
135 sb->s_export_op = &afs_export_ops;
137 #if defined(MAX_NON_LFS)
138 #ifdef AFS_64BIT_CLIENT
139 #if !defined(MAX_LFS_FILESIZE)
140 #if BITS_PER_LONG==32
141 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
142 #elif BITS_PER_LONG==64
143 #define MAX_LFS_FILESIZE 0x7fffffffffffffff
146 sb->s_maxbytes = MAX_LFS_FILESIZE;
148 sb->s_maxbytes = MAX_NON_LFS;
154 afs_globalVFS = NULL;
155 afs_FlushAllVCaches();
156 #if defined(HAVE_LINUX_BDI_INIT)
158 bdi_destroy(afs_backing_dev_info);
160 kfree(afs_backing_dev_info);
161 module_put(THIS_MODULE);
165 return code ? -EINVAL : 0;
169 /* afs_root - stat the root of the file system. AFS global held on entry. */
171 afs_root(struct super_block *afsp)
174 struct vcache *tvp = 0;
176 AFS_STATCNT(afs_root);
177 if (afs_globalVp && (afs_globalVp->f.states & CStatd)) {
180 struct vrequest *treq = NULL;
181 cred_t *credp = crref();
184 afs_PutVCache(afs_globalVp);
188 if (!(code = afs_CreateReq(&treq, credp)) && !(code = afs_CheckInit())) {
189 tvp = afs_GetVCache(&afs_rootFid, treq, NULL, NULL);
191 struct inode *ip = AFSTOV(tvp);
192 struct vattr *vattr = NULL;
194 code = afs_CreateAttr(&vattr);
196 afs_getattr(tvp, vattr, credp);
197 afs_fill_inode(ip, vattr);
199 /* setup super_block and mount point inode. */
201 #if defined(HAVE_LINUX_D_MAKE_ROOT)
202 afsp->s_root = d_make_root(ip);
204 afsp->s_root = d_alloc_root(ip);
206 #if !defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
207 afsp->s_root->d_op = &afs_dentry_operations;
209 afs_DestroyAttr(vattr);
215 afs_DestroyReq(treq);
218 afs_Trace2(afs_iclSetp, CM_TRACE_VFSROOT, ICL_TYPE_POINTER, afs_globalVp,
219 ICL_TYPE_INT32, code);
223 /* super_operations */
225 #if defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
226 static afs_kmem_cache_t *afs_inode_cachep;
228 static struct inode *
229 afs_alloc_inode(struct super_block *sb)
233 vcp = (struct vcache *) kmem_cache_alloc(afs_inode_cachep, KALLOC_TYPE);
241 afs_destroy_inode(struct inode *inode)
243 kmem_cache_free(afs_inode_cachep, inode);
247 init_once(void * foo)
249 struct vcache *vcp = (struct vcache *) foo;
251 inode_init_once(AFSTOV(vcp));
255 afs_init_inodecache(void)
257 #if defined(KMEM_CACHE_TAKES_DTOR)
258 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
259 sizeof(struct vcache), 0,
260 SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT, init_once_func, NULL);
262 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
263 sizeof(struct vcache), 0,
264 SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT, init_once_func);
266 if (afs_inode_cachep == NULL)
272 afs_destroy_inodecache(void)
274 if (afs_inode_cachep)
275 (void) kmem_cache_destroy(afs_inode_cachep);
279 afs_init_inodecache(void)
285 afs_destroy_inodecache(void)
291 #if defined(STRUCT_SUPER_OPERATIONS_HAS_EVICT_INODE)
293 afs_evict_inode(struct inode *ip)
295 struct vcache *vcp = VTOAFS(ip);
297 if (vcp->vlruq.prev || vcp->vlruq.next)
298 osi_Panic("inode freed while on LRU");
300 osi_Panic("inode freed while still hashed");
302 truncate_inode_pages(&ip->i_data, 0);
303 #if defined(HAVE_LINUX_CLEAR_INODE)
309 #if !defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
310 afs_osi_Free(ip->u.generic_ip, sizeof(struct vcache));
315 afs_clear_inode(struct inode *ip)
317 struct vcache *vcp = VTOAFS(ip);
319 if (vcp->vlruq.prev || vcp->vlruq.next)
320 osi_Panic("inode freed while on LRU");
322 osi_Panic("inode freed while still hashed");
324 #if !defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
325 afs_osi_Free(ip->u.generic_ip, sizeof(struct vcache));
331 * Called from unmount to release super_block. */
333 afs_put_super(struct super_block *sbp)
336 AFS_STATCNT(afs_unmount);
342 mntput(afs_cacheMnt);
344 osi_linux_verify_alloced_memory();
345 #if defined(HAVE_LINUX_BDI_INIT)
346 bdi_destroy(afs_backing_dev_info);
348 kfree(afs_backing_dev_info);
352 module_put(THIS_MODULE);
357 * statp is in user space, so we need to cobble together a statfs, then
361 #if defined(STATFS_TAKES_DENTRY)
362 afs_statfs(struct dentry *dentry, struct kstatfs *statp)
364 afs_statfs(struct super_block *sbp, struct kstatfs *statp)
367 memset(statp, 0, sizeof(*statp));
369 AFS_STATCNT(afs_statfs);
371 /* hardcode in case that which is giveth is taken away */
372 statp->f_type = 0x5346414F;
373 #if defined(STATFS_TAKES_DENTRY)
374 statp->f_bsize = dentry->d_sb->s_blocksize;
376 statp->f_bsize = sbp->s_blocksize;
378 statp->f_blocks = statp->f_bfree = statp->f_bavail = statp->f_files =
379 statp->f_ffree = AFS_VFS_FAKEFREE;
380 statp->f_fsid.val[0] = AFS_VFSMAGIC;
381 statp->f_fsid.val[1] = AFS_VFSFSID;
382 statp->f_namelen = 256;
387 struct super_operations afs_sops = {
388 #if defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
389 .alloc_inode = afs_alloc_inode,
390 .destroy_inode = afs_destroy_inode,
392 #if defined(STRUCT_SUPER_OPERATIONS_HAS_EVICT_INODE)
393 .evict_inode = afs_evict_inode,
395 .clear_inode = afs_clear_inode,
397 .put_super = afs_put_super,
398 .statfs = afs_statfs,