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"
21 #define __NO_VERSION__ /* don't define kernel_version in module.h */
22 #include <linux/module.h> /* early to avoid printf->printk mapping */
23 #include "afs/sysincludes.h"
24 #include "afsincludes.h"
25 #include "afs/afs_stats.h"
26 #if !defined(AFS_LINUX26_ENV)
29 #if defined(AFS_LINUX24_ENV)
30 #include "h/smp_lock.h"
34 struct vcache *afs_globalVp = 0;
35 struct vfs *afs_globalVFS = 0;
36 #if defined(AFS_LINUX24_ENV)
37 struct vfsmount *afs_cacheMnt;
39 int afs_was_mounted = 0; /* Used to force reload if mount/unmount/mount */
41 extern struct super_operations afs_sops;
42 #if defined(AFS_LINUX26_ENV) && !defined(AFS_NONFSTRANS)
43 extern struct export_operations afs_export_ops;
45 extern afs_rwlock_t afs_xvcache;
46 extern struct afs_q VLRU;
48 extern struct dentry_operations afs_dentry_operations;
50 /* Forward declarations */
51 static void iattr2vattr(struct vattr *vattrp, struct iattr *iattrp);
52 static int afs_root(struct super_block *afsp);
53 struct super_block *afs_read_super(struct super_block *sb, void *data, int silent);
54 int afs_fill_super(struct super_block *sb, void *data, int silent);
57 * VFS entry for Linux - installed in init_module
58 * Linux mounts file systems by:
59 * 1) register_filesystem(&afs_file_system) - done in init_module
60 * 2) Mount call comes to us via do_mount -> read_super -> afs_read_super.
61 * We are expected to setup the super_block. See afs_read_super.
66 * read the "super block" for AFS - roughly eguivalent to struct vfs.
67 * dev, covered, s_rd_only, s_dirt, and s_type will be set by read_super.
69 #if defined(AFS_LINUX26_ENV)
70 #ifdef GET_SB_HAS_STRUCT_VFSMOUNT
72 afs_get_sb(struct file_system_type *fs_type, int flags,
73 const char *dev_name, void *data, struct vfsmount *mnt)
75 static struct superblock *
76 afs_get_sb(struct file_system_type *fs_type, int flags,
77 const char *dev_name, void *data)
80 #ifdef GET_SB_HAS_STRUCT_VFSMOUNT
81 return get_sb_nodev(fs_type, flags, data, afs_fill_super, mnt);
83 return get_sb_nodev(fs_type, flags, data, afs_fill_super);
88 struct file_system_type afs_fs_type = {
92 .kill_sb = kill_anon_super,
93 .fs_flags = FS_BINARY_MOUNTDATA,
95 #elif defined(AFS_LINUX24_ENV)
96 DECLARE_FSTYPE(afs_fs_type, "afs", afs_read_super, 0);
98 struct file_system_type afs_fs_type = {
99 "afs", /* name - used by mount operation. */
100 0, /* requires_dev - no for network filesystems. mount() will
101 * pass us an "unnamed" device. */
102 afs_read_super, /* wrapper to afs_mount */
103 NULL /* pointer to next file_system_type once registered. */
107 #if defined(AFS_LINUX26_ENV)
108 struct backing_dev_info afs_backing_dev_info = {
109 .ra_pages = 0, /* disable readahead, afs does prefetch */
113 afs_fill_super(struct super_block *sb, void *data, int silent)
116 afs_read_super(struct super_block *sb, void *data, int silent)
122 if (afs_was_mounted) {
124 ("You must reload the AFS kernel extensions before remounting AFS.\n");
126 #if defined(AFS_LINUX26_ENV)
134 /* Set basics of super_block */
135 #if !defined(AFS_LINUX24_ENV)
138 #if defined(AFS_LINUX26_ENV)
139 __module_get(THIS_MODULE);
145 sb->s_blocksize = 1024;
146 sb->s_blocksize_bits = 10;
147 sb->s_magic = AFS_VFSMAGIC;
148 sb->s_op = &afs_sops; /* Super block (vfs) ops */
149 #if defined(AFS_LINUX26_ENV) && !defined(AFS_NONFSTRANS)
150 sb->s_export_op = &afs_export_ops;
152 #if defined(MAX_NON_LFS)
153 #ifdef AFS_64BIT_CLIENT
154 #if !defined(MAX_LFS_FILESIZE)
155 #if BITS_PER_LONG==32
156 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
157 #elif BITS_PER_LONG==64
158 #define MAX_LFS_FILESIZE 0x7fffffffffffffff
161 sb->s_maxbytes = MAX_LFS_FILESIZE;
163 sb->s_maxbytes = MAX_NON_LFS;
168 afs_globalVFS = NULL;
169 #if defined(AFS_LINUX26_ENV)
170 module_put(THIS_MODULE);
176 #if !defined(AFS_LINUX24_ENV)
181 #if defined(AFS_LINUX26_ENV)
182 return code ? -EINVAL : 0;
184 return code ? NULL : sb;
189 /* afs_root - stat the root of the file system. AFS global held on entry. */
191 afs_root(struct super_block *afsp)
193 register afs_int32 code = 0;
194 struct vrequest treq;
195 register struct vcache *tvp = 0;
197 AFS_STATCNT(afs_root);
198 if (afs_globalVp && (afs_globalVp->states & CStatd)) {
201 cred_t *credp = crref();
204 afs_PutVCache(afs_globalVp);
208 if (!(code = afs_InitReq(&treq, credp)) && !(code = afs_CheckInit())) {
209 tvp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
211 struct inode *ip = AFSTOV(tvp);
214 afs_getattr(tvp, &vattr, credp);
215 afs_fill_inode(ip, &vattr);
217 /* setup super_block and mount point inode. */
219 #if defined(AFS_LINUX24_ENV)
220 afsp->s_root = d_alloc_root(ip);
222 afsp->s_root = d_alloc_root(ip, NULL);
224 afsp->s_root->d_op = &afs_dentry_operations;
231 afs_Trace2(afs_iclSetp, CM_TRACE_VFSROOT, ICL_TYPE_POINTER, afs_globalVp,
232 ICL_TYPE_INT32, code);
236 /* super_operations */
239 * Linux version of setattr call. What to change is in the iattr struct.
240 * We need to set bits in both the Linux inode as well as the vcache.
243 afs_notify_change(struct dentry *dp, struct iattr *iattrp)
246 cred_t *credp = crref();
247 struct inode *ip = dp->d_inode;
251 iattr2vattr(&vattr, iattrp); /* Convert for AFS vnodeops call. */
253 #if defined(AFS_LINUX26_ENV)
257 code = afs_setattr(VTOAFS(ip), &vattr, credp);
259 afs_getattr(VTOAFS(ip), &vattr, credp);
260 vattr2inode(ip, &vattr);
263 #if defined(AFS_LINUX26_ENV)
271 #if defined(STRUCT_SUPER_HAS_ALLOC_INODE)
272 #if defined(HAVE_KMEM_CACHE_T)
273 static kmem_cache_t *afs_inode_cachep;
275 struct kmem_cache *afs_inode_cachep;
278 static struct inode *
279 afs_alloc_inode(struct super_block *sb)
283 #if defined(SLAB_KERNEL)
284 vcp = (struct vcache *) kmem_cache_alloc(afs_inode_cachep, SLAB_KERNEL);
286 vcp = (struct vcache *) kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
295 afs_destroy_inode(struct inode *inode)
297 kmem_cache_free(afs_inode_cachep, inode);
301 #if defined(HAVE_KMEM_CACHE_T)
302 init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
304 #if defined(KMEM_CACHE_INIT)
305 init_once(struct kmem_cache * cachep, void * foo)
307 init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
311 struct vcache *vcp = (struct vcache *) foo;
313 #if defined(SLAB_CTOR_VERIFY)
314 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
315 SLAB_CTOR_CONSTRUCTOR)
317 inode_init_once(AFSTOV(vcp));
321 afs_init_inodecache(void)
323 #ifndef SLAB_RECLAIM_ACCOUNT
324 #define SLAB_RECLAIM_ACCOUNT 0
327 #if defined(KMEM_CACHE_TAKES_DTOR)
328 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
329 sizeof(struct vcache),
330 0, SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT,
333 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
334 sizeof(struct vcache),
335 0, SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT,
338 if (afs_inode_cachep == NULL)
344 afs_destroy_inodecache(void)
346 if (afs_inode_cachep)
347 (void) kmem_cache_destroy(afs_inode_cachep);
351 afs_init_inodecache(void)
357 afs_destroy_inodecache(void)
364 afs_clear_inode(struct inode *ip)
366 struct vcache *vcp = VTOAFS(ip);
368 if (vcp->vlruq.prev || vcp->vlruq.next)
369 osi_Panic("inode freed while on LRU");
371 osi_Panic("inode freed while still hashed");
373 #if !defined(STRUCT_SUPER_HAS_ALLOC_INODE)
374 afs_osi_Free(ip->u.generic_ip, sizeof(struct vcache));
379 * Called from unmount to release super_block. */
381 afs_put_super(struct super_block *sbp)
384 AFS_STATCNT(afs_unmount);
386 #if !defined(AFS_LINUX26_ENV)
396 osi_linux_free_inode_pages(); /* invalidate and release remaining AFS inodes. */
398 #if defined(AFS_LINUX24_ENV)
399 mntput(afs_cacheMnt);
402 osi_linux_verify_alloced_memory();
406 #if defined(AFS_LINUX26_ENV)
407 module_put(THIS_MODULE);
415 * statp is in user space, so we need to cobble together a statfs, then
418 #if defined(AFS_LINUX26_ENV)
420 #if defined(STATFS_TAKES_DENTRY)
421 afs_statfs(struct dentry *dentry, struct kstatfs *statp)
423 afs_statfs(struct super_block *sbp, struct kstatfs *statp)
425 #elif defined(AFS_LINUX24_ENV)
427 afs_statfs(struct super_block *sbp, struct statfs *statp)
430 afs_statfs(struct super_block *sbp, struct statfs *__statp, int size)
433 #if !defined(AFS_LINUX24_ENV)
434 struct statfs stat, *statp;
436 if (size < sizeof(struct statfs))
439 memset(&stat, 0, size);
442 memset(statp, 0, sizeof(*statp));
445 AFS_STATCNT(afs_statfs);
447 /* hardcode in case that which is giveth is taken away */
448 statp->f_type = 0x5346414F;
449 #if defined(STATFS_TAKES_DENTRY)
450 statp->f_bsize = dentry->d_sb->s_blocksize;
452 statp->f_bsize = sbp->s_blocksize;
454 statp->f_blocks = statp->f_bfree = statp->f_bavail = statp->f_files =
455 statp->f_ffree = 9000000;
456 statp->f_fsid.val[0] = AFS_VFSMAGIC;
457 statp->f_fsid.val[1] = AFS_VFSFSID;
458 statp->f_namelen = 256;
460 #if !defined(AFS_LINUX24_ENV)
461 memcpy_tofs(__statp, &stat, size);
466 struct super_operations afs_sops = {
467 #if defined(STRUCT_SUPER_HAS_ALLOC_INODE)
468 .alloc_inode = afs_alloc_inode,
469 .destroy_inode = afs_destroy_inode,
471 .clear_inode = afs_clear_inode,
472 .put_super = afs_put_super,
473 .statfs = afs_statfs,
474 #if !defined(AFS_LINUX24_ENV)
475 .notify_change = afs_notify_change,
479 /************** Support routines ************************/
482 * Set iattr data into vattr. Assume vattr cleared before call.
485 iattr2vattr(struct vattr *vattrp, struct iattr *iattrp)
487 vattrp->va_mask = iattrp->ia_valid;
488 if (iattrp->ia_valid & ATTR_MODE)
489 vattrp->va_mode = iattrp->ia_mode;
490 if (iattrp->ia_valid & ATTR_UID)
491 vattrp->va_uid = iattrp->ia_uid;
492 if (iattrp->ia_valid & ATTR_GID)
493 vattrp->va_gid = iattrp->ia_gid;
494 if (iattrp->ia_valid & ATTR_SIZE)
495 vattrp->va_size = iattrp->ia_size;
496 if (iattrp->ia_valid & ATTR_ATIME) {
497 #if defined(AFS_LINUX26_ENV)
498 vattrp->va_atime.tv_sec = iattrp->ia_atime.tv_sec;
500 vattrp->va_atime.tv_sec = iattrp->ia_atime;
502 vattrp->va_atime.tv_usec = 0;
504 if (iattrp->ia_valid & ATTR_MTIME) {
505 #if defined(AFS_LINUX26_ENV)
506 vattrp->va_mtime.tv_sec = iattrp->ia_mtime.tv_sec;
508 vattrp->va_mtime.tv_sec = iattrp->ia_mtime;
510 vattrp->va_mtime.tv_usec = 0;
512 if (iattrp->ia_valid & ATTR_CTIME) {
513 #if defined(AFS_LINUX26_ENV)
514 vattrp->va_ctime.tv_sec = iattrp->ia_ctime.tv_sec;
516 vattrp->va_ctime.tv_sec = iattrp->ia_ctime;
518 vattrp->va_ctime.tv_usec = 0;
523 * Rewrite the inode cache from the attr. Assumes all vattr fields are valid.
526 vattr2inode(struct inode *ip, struct vattr *vp)
528 ip->i_ino = vp->va_nodeid;
529 ip->i_nlink = vp->va_nlink;
530 ip->i_blocks = vp->va_blocks;
531 #ifdef STRUCT_INODE_HAS_I_BLKBITS
532 ip->i_blkbits = AFS_BLKBITS;
534 #ifdef STRUCT_INODE_HAS_I_BLKSIZE
535 ip->i_blksize = vp->va_blocksize;
537 ip->i_rdev = vp->va_rdev;
538 ip->i_mode = vp->va_mode;
539 ip->i_uid = vp->va_uid;
540 ip->i_gid = vp->va_gid;
541 ip->i_size = vp->va_size;
542 #if defined(AFS_LINUX26_ENV)
543 ip->i_atime.tv_sec = vp->va_atime.tv_sec;
544 ip->i_atime.tv_nsec = 0;
545 ip->i_mtime.tv_sec = vp->va_mtime.tv_sec;
546 /* Set the mtime nanoseconds to the sysname generation number.
547 * This convinces NFS clients that all directories have changed
548 * any time the sysname list changes.
550 ip->i_mtime.tv_nsec = afs_sysnamegen;
551 ip->i_ctime.tv_sec = vp->va_ctime.tv_sec;
552 ip->i_ctime.tv_nsec = 0;
554 ip->i_atime = vp->va_atime.tv_sec;
555 ip->i_mtime = vp->va_mtime.tv_sec;
556 ip->i_ctime = vp->va_ctime.tv_sec;
560 /* osi_linux_free_inode_pages
562 * Free all vnodes remaining in the afs hash. Must be done before
563 * shutting down afs and freeing all memory.
566 osi_linux_free_inode_pages(void)
569 struct vcache *tvc, *nvc;
570 extern struct vcache *afs_vhashT[VCSIZE];
572 for (i = 0; i < VCSIZE; i++) {
573 for (tvc = afs_vhashT[i]; tvc; ) {
577 if (afs_FlushVCache(tvc, &slept)) /* slept always 0 for linux? */
578 printf("Failed to invalidate all pages on inode 0x%p\n", tvc);