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)
92 if (afs_was_mounted) {
94 ("You must reload the AFS kernel extensions before remounting AFS.\n");
100 /* Set basics of super_block */
101 __module_get(THIS_MODULE);
104 sb->s_flags |= MS_NOATIME;
105 sb->s_blocksize = 1024;
106 sb->s_blocksize_bits = 10;
107 sb->s_magic = AFS_VFSMAGIC;
108 sb->s_op = &afs_sops; /* Super block (vfs) ops */
110 #if defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
111 sb->s_d_op = &afs_dentry_operations;
114 /* used for inodes backing_dev_info field, also */
115 afs_backing_dev_info = kzalloc(sizeof(struct backing_dev_info), GFP_NOFS);
116 #if defined(HAVE_LINUX_BDI_INIT)
117 bdi_init(afs_backing_dev_info);
119 #if defined(STRUCT_BACKING_DEV_INFO_HAS_NAME)
120 afs_backing_dev_info->name = "openafs";
122 afs_backing_dev_info->ra_pages = 32;
123 #if defined (STRUCT_SUPER_BLOCK_HAS_S_BDI)
124 sb->s_bdi = afs_backing_dev_info;
125 /* The name specified here will appear in the flushing thread name - flush-afs */
126 bdi_register(afs_backing_dev_info, NULL, "afs");
128 #if !defined(AFS_NONFSTRANS)
129 sb->s_export_op = &afs_export_ops;
131 #if defined(MAX_NON_LFS)
132 #ifdef AFS_64BIT_CLIENT
133 #if !defined(MAX_LFS_FILESIZE)
134 #if BITS_PER_LONG==32
135 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
136 #elif BITS_PER_LONG==64
137 #define MAX_LFS_FILESIZE 0x7fffffffffffffff
140 sb->s_maxbytes = MAX_LFS_FILESIZE;
142 sb->s_maxbytes = MAX_NON_LFS;
147 afs_globalVFS = NULL;
148 afs_FlushAllVCaches();
149 module_put(THIS_MODULE);
153 return code ? -EINVAL : 0;
157 /* afs_root - stat the root of the file system. AFS global held on entry. */
159 afs_root(struct super_block *afsp)
162 struct vrequest treq;
163 struct vcache *tvp = 0;
165 AFS_STATCNT(afs_root);
166 if (afs_globalVp && (afs_globalVp->f.states & CStatd)) {
169 cred_t *credp = crref();
172 afs_PutVCache(afs_globalVp);
176 if (!(code = afs_InitReq(&treq, credp)) && !(code = afs_CheckInit())) {
177 tvp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
179 struct inode *ip = AFSTOV(tvp);
182 afs_getattr(tvp, &vattr, credp);
183 afs_fill_inode(ip, &vattr);
185 /* setup super_block and mount point inode. */
187 afsp->s_root = d_alloc_root(ip);
188 #if !defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
189 afsp->s_root->d_op = &afs_dentry_operations;
197 afs_Trace2(afs_iclSetp, CM_TRACE_VFSROOT, ICL_TYPE_POINTER, afs_globalVp,
198 ICL_TYPE_INT32, code);
202 /* super_operations */
204 #if defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
205 static afs_kmem_cache_t *afs_inode_cachep;
207 static struct inode *
208 afs_alloc_inode(struct super_block *sb)
212 vcp = (struct vcache *) kmem_cache_alloc(afs_inode_cachep, KALLOC_TYPE);
220 afs_destroy_inode(struct inode *inode)
222 kmem_cache_free(afs_inode_cachep, inode);
226 init_once(void * foo)
228 struct vcache *vcp = (struct vcache *) foo;
230 inode_init_once(AFSTOV(vcp));
234 afs_init_inodecache(void)
236 #if defined(KMEM_CACHE_TAKES_DTOR)
237 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
238 sizeof(struct vcache), 0,
239 SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT, init_once_func, NULL);
241 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
242 sizeof(struct vcache), 0,
243 SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT, init_once_func);
245 if (afs_inode_cachep == NULL)
251 afs_destroy_inodecache(void)
253 if (afs_inode_cachep)
254 (void) kmem_cache_destroy(afs_inode_cachep);
258 afs_init_inodecache(void)
264 afs_destroy_inodecache(void)
270 #if defined(STRUCT_SUPER_OPERATIONS_HAS_EVICT_INODE)
272 afs_evict_inode(struct inode *ip)
274 struct vcache *vcp = VTOAFS(ip);
276 if (vcp->vlruq.prev || vcp->vlruq.next)
277 osi_Panic("inode freed while on LRU");
279 osi_Panic("inode freed while still hashed");
281 truncate_inode_pages(&ip->i_data, 0);
284 #if !defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
285 afs_osi_Free(ip->u.generic_ip, sizeof(struct vcache));
290 afs_clear_inode(struct inode *ip)
292 struct vcache *vcp = VTOAFS(ip);
294 if (vcp->vlruq.prev || vcp->vlruq.next)
295 osi_Panic("inode freed while on LRU");
297 osi_Panic("inode freed while still hashed");
299 #if !defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
300 afs_osi_Free(ip->u.generic_ip, sizeof(struct vcache));
306 * Called from unmount to release super_block. */
308 afs_put_super(struct super_block *sbp)
311 AFS_STATCNT(afs_unmount);
317 mntput(afs_cacheMnt);
319 osi_linux_verify_alloced_memory();
320 #if defined(HAVE_LINUX_BDI_INIT)
321 bdi_destroy(afs_backing_dev_info);
323 kfree(afs_backing_dev_info);
327 module_put(THIS_MODULE);
332 * statp is in user space, so we need to cobble together a statfs, then
336 #if defined(STATFS_TAKES_DENTRY)
337 afs_statfs(struct dentry *dentry, struct kstatfs *statp)
339 afs_statfs(struct super_block *sbp, struct kstatfs *statp)
342 memset(statp, 0, sizeof(*statp));
344 AFS_STATCNT(afs_statfs);
346 /* hardcode in case that which is giveth is taken away */
347 statp->f_type = 0x5346414F;
348 #if defined(STATFS_TAKES_DENTRY)
349 statp->f_bsize = dentry->d_sb->s_blocksize;
351 statp->f_bsize = sbp->s_blocksize;
353 statp->f_blocks = statp->f_bfree = statp->f_bavail = statp->f_files =
354 statp->f_ffree = 9000000;
355 statp->f_fsid.val[0] = AFS_VFSMAGIC;
356 statp->f_fsid.val[1] = AFS_VFSFSID;
357 statp->f_namelen = 256;
362 struct super_operations afs_sops = {
363 #if defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
364 .alloc_inode = afs_alloc_inode,
365 .destroy_inode = afs_destroy_inode,
367 #if defined(STRUCT_SUPER_OPERATIONS_HAS_EVICT_INODE)
368 .evict_inode = afs_evict_inode,
370 .clear_inode = afs_clear_inode,
372 .put_super = afs_put_super,
373 .statfs = afs_statfs,