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"
24 #include <linux/smp_lock.h>
26 #include "osi_compat.h"
28 struct vcache *afs_globalVp = 0;
29 struct vfs *afs_globalVFS = 0;
30 struct vfsmount *afs_cacheMnt;
31 int afs_was_mounted = 0; /* Used to force reload if mount/unmount/mount */
33 extern struct super_operations afs_sops;
34 #if !defined(AFS_NONFSTRANS)
35 extern struct export_operations afs_export_ops;
37 extern afs_rwlock_t afs_xvcache;
38 extern struct afs_q VLRU;
40 extern struct dentry_operations afs_dentry_operations;
42 /* Forward declarations */
43 static void iattr2vattr(struct vattr *vattrp, struct iattr *iattrp);
44 static int afs_root(struct super_block *afsp);
45 int afs_fill_super(struct super_block *sb, void *data, int silent);
49 * afs_mount (2.6.37+) and afs_get_sb (2.6.36-) are the entry
50 * points from the vfs when mounting afs. The super block
51 * structure is setup in the afs_fill_super callback function.
54 #if defined(STRUCT_FILE_SYSTEM_TYPE_HAS_MOUNT)
55 static struct dentry *
56 afs_mount(struct file_system_type *fs_type, int flags,
57 const char *dev_name, void *data) {
58 return mount_nodev(fs_type, flags, data, afs_fill_super);
60 #elif defined(GET_SB_HAS_STRUCT_VFSMOUNT)
62 afs_get_sb(struct file_system_type *fs_type, int flags,
63 const char *dev_name, void *data, struct vfsmount *mnt) {
64 return get_sb_nodev(fs_type, flags, data, afs_fill_super, mnt);
67 static struct super_block *
68 afs_get_sb(struct file_system_type *fs_type, int flags,
69 const char *dev_name, void *data) {
70 return get_sb_nodev(fs_type, flags, data, afs_fill_super);
74 struct file_system_type afs_fs_type = {
77 #if defined(STRUCT_FILE_SYSTEM_TYPE_HAS_MOUNT)
82 .kill_sb = kill_anon_super,
83 .fs_flags = FS_BINARY_MOUNTDATA,
86 struct backing_dev_info *afs_backing_dev_info;
89 afs_fill_super(struct super_block *sb, void *data, int silent)
94 if (afs_was_mounted) {
96 ("You must reload the AFS kernel extensions before remounting AFS.\n");
102 /* Set basics of super_block */
103 __module_get(THIS_MODULE);
106 sb->s_flags |= MS_NOATIME;
107 sb->s_blocksize = 1024;
108 sb->s_blocksize_bits = 10;
109 sb->s_magic = AFS_VFSMAGIC;
110 sb->s_op = &afs_sops; /* Super block (vfs) ops */
111 /* used for inodes backing_dev_info field, also */
112 afs_backing_dev_info = osi_Alloc(sizeof(struct backing_dev_info));
113 #if defined(HAVE_LINUX_BDI_INIT)
114 bdi_init(afs_backing_dev_info);
116 #if defined(STRUCT_BACKING_DEV_INFO_HAS_NAME)
117 afs_backing_dev_info->name = "openafs";
119 afs_backing_dev_info->ra_pages = 32;
120 #if defined (STRUCT_SUPER_BLOCK_HAS_S_BDI)
121 sb->s_bdi = afs_backing_dev_info;
122 /* The name specified here will appear in the flushing thread name - flush-afs */
123 bdi_register(afs_backing_dev_info, NULL, "afs");
125 #if !defined(AFS_NONFSTRANS)
126 sb->s_export_op = &afs_export_ops;
128 #if defined(MAX_NON_LFS)
129 #ifdef AFS_64BIT_CLIENT
130 #if !defined(MAX_LFS_FILESIZE)
131 #if BITS_PER_LONG==32
132 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
133 #elif BITS_PER_LONG==64
134 #define MAX_LFS_FILESIZE 0x7fffffffffffffff
137 sb->s_maxbytes = MAX_LFS_FILESIZE;
139 sb->s_maxbytes = MAX_NON_LFS;
144 afs_globalVFS = NULL;
145 osi_linux_free_inode_pages();
146 module_put(THIS_MODULE);
150 return code ? -EINVAL : 0;
154 /* afs_root - stat the root of the file system. AFS global held on entry. */
156 afs_root(struct super_block *afsp)
159 struct vrequest treq;
160 struct vcache *tvp = 0;
162 AFS_STATCNT(afs_root);
163 if (afs_globalVp && (afs_globalVp->f.states & CStatd)) {
166 cred_t *credp = crref();
169 afs_PutVCache(afs_globalVp);
173 if (!(code = afs_InitReq(&treq, credp)) && !(code = afs_CheckInit())) {
174 tvp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
176 struct inode *ip = AFSTOV(tvp);
179 afs_getattr(tvp, &vattr, credp);
180 afs_fill_inode(ip, &vattr);
182 /* setup super_block and mount point inode. */
184 afsp->s_root = d_alloc_root(ip);
185 afsp->s_root->d_op = &afs_dentry_operations;
192 afs_Trace2(afs_iclSetp, CM_TRACE_VFSROOT, ICL_TYPE_POINTER, afs_globalVp,
193 ICL_TYPE_INT32, code);
197 /* super_operations */
200 * Linux version of setattr call. What to change is in the iattr struct.
201 * We need to set bits in both the Linux inode as well as the vcache.
204 afs_notify_change(struct dentry *dp, struct iattr *iattrp)
207 cred_t *credp = crref();
208 struct inode *ip = dp->d_inode;
212 iattr2vattr(&vattr, iattrp); /* Convert for AFS vnodeops call. */
215 code = afs_setattr(VTOAFS(ip), &vattr, credp);
217 afs_getattr(VTOAFS(ip), &vattr, credp);
218 vattr2inode(ip, &vattr);
226 #if defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
227 static afs_kmem_cache_t *afs_inode_cachep;
229 static struct inode *
230 afs_alloc_inode(struct super_block *sb)
234 vcp = (struct vcache *) kmem_cache_alloc(afs_inode_cachep, KALLOC_TYPE);
242 afs_destroy_inode(struct inode *inode)
244 kmem_cache_free(afs_inode_cachep, inode);
248 init_once(void * foo)
250 struct vcache *vcp = (struct vcache *) foo;
252 inode_init_once(AFSTOV(vcp));
256 afs_init_inodecache(void)
258 #if defined(KMEM_CACHE_TAKES_DTOR)
259 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
260 sizeof(struct vcache), 0,
261 SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT, init_once_func, NULL);
263 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
264 sizeof(struct vcache), 0,
265 SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT, init_once_func);
267 if (afs_inode_cachep == NULL)
273 afs_destroy_inodecache(void)
275 if (afs_inode_cachep)
276 (void) kmem_cache_destroy(afs_inode_cachep);
280 afs_init_inodecache(void)
286 afs_destroy_inodecache(void)
292 #if defined(STRUCT_SUPER_OPERATIONS_HAS_EVICT_INODE)
294 afs_evict_inode(struct inode *ip)
296 struct vcache *vcp = VTOAFS(ip);
298 if (vcp->vlruq.prev || vcp->vlruq.next)
299 osi_Panic("inode freed while on LRU");
301 osi_Panic("inode freed while still hashed");
303 truncate_inode_pages(&ip->i_data, 0);
306 #if !defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
307 afs_osi_Free(ip->u.generic_ip, sizeof(struct vcache));
312 afs_clear_inode(struct inode *ip)
314 struct vcache *vcp = VTOAFS(ip);
316 if (vcp->vlruq.prev || vcp->vlruq.next)
317 osi_Panic("inode freed while on LRU");
319 osi_Panic("inode freed while still hashed");
321 #if !defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
322 afs_osi_Free(ip->u.generic_ip, sizeof(struct vcache));
328 * Called from unmount to release super_block. */
330 afs_put_super(struct super_block *sbp)
333 AFS_STATCNT(afs_unmount);
338 osi_linux_free_inode_pages(); /* invalidate and release remaining AFS inodes. */
340 mntput(afs_cacheMnt);
342 osi_linux_verify_alloced_memory();
343 #if defined(HAVE_LINUX_BDI_INIT)
344 bdi_destroy(afs_backing_dev_info);
346 osi_Free(afs_backing_dev_info, sizeof(struct backing_dev_info));
350 module_put(THIS_MODULE);
355 * statp is in user space, so we need to cobble together a statfs, then
359 #if defined(STATFS_TAKES_DENTRY)
360 afs_statfs(struct dentry *dentry, struct kstatfs *statp)
362 afs_statfs(struct super_block *sbp, struct kstatfs *statp)
365 memset(statp, 0, sizeof(*statp));
367 AFS_STATCNT(afs_statfs);
369 /* hardcode in case that which is giveth is taken away */
370 statp->f_type = 0x5346414F;
371 #if defined(STATFS_TAKES_DENTRY)
372 statp->f_bsize = dentry->d_sb->s_blocksize;
374 statp->f_bsize = sbp->s_blocksize;
376 statp->f_blocks = statp->f_bfree = statp->f_bavail = statp->f_files =
377 statp->f_ffree = 9000000;
378 statp->f_fsid.val[0] = AFS_VFSMAGIC;
379 statp->f_fsid.val[1] = AFS_VFSFSID;
380 statp->f_namelen = 256;
385 struct super_operations afs_sops = {
386 #if defined(STRUCT_SUPER_OPERATIONS_HAS_ALLOC_INODE)
387 .alloc_inode = afs_alloc_inode,
388 .destroy_inode = afs_destroy_inode,
390 #if defined(STRUCT_SUPER_OPERATIONS_HAS_EVICT_INODE)
391 .evict_inode = afs_evict_inode,
393 .clear_inode = afs_clear_inode,
395 .put_super = afs_put_super,
396 .statfs = afs_statfs,
399 /************** Support routines ************************/
402 * Set iattr data into vattr. Assume vattr cleared before call.
405 iattr2vattr(struct vattr *vattrp, struct iattr *iattrp)
407 vattrp->va_mask = iattrp->ia_valid;
408 if (iattrp->ia_valid & ATTR_MODE)
409 vattrp->va_mode = iattrp->ia_mode;
410 if (iattrp->ia_valid & ATTR_UID)
411 vattrp->va_uid = iattrp->ia_uid;
412 if (iattrp->ia_valid & ATTR_GID)
413 vattrp->va_gid = iattrp->ia_gid;
414 if (iattrp->ia_valid & ATTR_SIZE)
415 vattrp->va_size = iattrp->ia_size;
416 if (iattrp->ia_valid & ATTR_ATIME) {
417 vattrp->va_atime.tv_sec = iattrp->ia_atime.tv_sec;
418 vattrp->va_atime.tv_usec = 0;
420 if (iattrp->ia_valid & ATTR_MTIME) {
421 vattrp->va_mtime.tv_sec = iattrp->ia_mtime.tv_sec;
422 vattrp->va_mtime.tv_usec = 0;
424 if (iattrp->ia_valid & ATTR_CTIME) {
425 vattrp->va_ctime.tv_sec = iattrp->ia_ctime.tv_sec;
426 vattrp->va_ctime.tv_usec = 0;
431 * Rewrite the inode cache from the attr. Assumes all vattr fields are valid.
434 vattr2inode(struct inode *ip, struct vattr *vp)
436 ip->i_ino = vp->va_nodeid;
437 ip->i_nlink = vp->va_nlink;
438 ip->i_blocks = vp->va_blocks;
439 #ifdef STRUCT_INODE_HAS_I_BLKBITS
440 ip->i_blkbits = AFS_BLKBITS;
442 #ifdef STRUCT_INODE_HAS_I_BLKSIZE
443 ip->i_blksize = vp->va_blocksize;
445 ip->i_rdev = vp->va_rdev;
446 ip->i_mode = vp->va_mode;
447 ip->i_uid = vp->va_uid;
448 ip->i_gid = vp->va_gid;
449 i_size_write(ip, vp->va_size);
450 ip->i_atime.tv_sec = vp->va_atime.tv_sec;
451 ip->i_atime.tv_nsec = 0;
452 ip->i_mtime.tv_sec = vp->va_mtime.tv_sec;
453 /* Set the mtime nanoseconds to the sysname generation number.
454 * This convinces NFS clients that all directories have changed
455 * any time the sysname list changes.
457 ip->i_mtime.tv_nsec = afs_sysnamegen;
458 ip->i_ctime.tv_sec = vp->va_ctime.tv_sec;
459 ip->i_ctime.tv_nsec = 0;
462 /* osi_linux_free_inode_pages
464 * Free all vnodes remaining in the afs hash. Must be done before
465 * shutting down afs and freeing all memory.
468 osi_linux_free_inode_pages(void)
471 struct vcache *tvc, *nvc;
472 extern struct vcache *afs_vhashT[VCSIZE];
474 for (i = 0; i < VCSIZE; i++) {
475 for (tvc = afs_vhashT[i]; tvc; ) {
479 if (afs_FlushVCache(tvc, &slept)) /* slept always 0 for linux? */
480 printf("Failed to invalidate all pages on inode 0x%p\n", tvc);