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(HAVE_BDI_INIT)
153 bdi_init(&afs_backing_dev_info);
155 #if defined(MAX_NON_LFS)
156 #ifdef AFS_64BIT_CLIENT
157 #if !defined(MAX_LFS_FILESIZE)
158 #if BITS_PER_LONG==32
159 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
160 #elif BITS_PER_LONG==64
161 #define MAX_LFS_FILESIZE 0x7fffffffffffffff
164 sb->s_maxbytes = MAX_LFS_FILESIZE;
166 sb->s_maxbytes = MAX_NON_LFS;
171 afs_globalVFS = NULL;
172 #if defined(AFS_LINUX26_ENV)
173 module_put(THIS_MODULE);
179 #if !defined(AFS_LINUX24_ENV)
184 #if defined(AFS_LINUX26_ENV)
185 return code ? -EINVAL : 0;
187 return code ? NULL : sb;
192 /* afs_root - stat the root of the file system. AFS global held on entry. */
194 afs_root(struct super_block *afsp)
196 register afs_int32 code = 0;
197 struct vrequest treq;
198 register struct vcache *tvp = 0;
200 AFS_STATCNT(afs_root);
201 if (afs_globalVp && (afs_globalVp->states & CStatd)) {
204 cred_t *credp = crref();
207 afs_PutVCache(afs_globalVp);
211 if (!(code = afs_InitReq(&treq, credp)) && !(code = afs_CheckInit())) {
212 tvp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
214 struct inode *ip = AFSTOV(tvp);
217 afs_getattr(tvp, &vattr, credp);
218 afs_fill_inode(ip, &vattr);
220 /* setup super_block and mount point inode. */
222 #if defined(AFS_LINUX24_ENV)
223 afsp->s_root = d_alloc_root(ip);
225 afsp->s_root = d_alloc_root(ip, NULL);
227 afsp->s_root->d_op = &afs_dentry_operations;
234 afs_Trace2(afs_iclSetp, CM_TRACE_VFSROOT, ICL_TYPE_POINTER, afs_globalVp,
235 ICL_TYPE_INT32, code);
239 /* super_operations */
242 * Linux version of setattr call. What to change is in the iattr struct.
243 * We need to set bits in both the Linux inode as well as the vcache.
246 afs_notify_change(struct dentry *dp, struct iattr *iattrp)
249 cred_t *credp = crref();
250 struct inode *ip = dp->d_inode;
254 iattr2vattr(&vattr, iattrp); /* Convert for AFS vnodeops call. */
256 #if defined(AFS_LINUX26_ENV)
260 code = afs_setattr(VTOAFS(ip), &vattr, credp);
262 afs_getattr(VTOAFS(ip), &vattr, credp);
263 vattr2inode(ip, &vattr);
266 #if defined(AFS_LINUX26_ENV)
274 #if defined(STRUCT_SUPER_HAS_ALLOC_INODE)
275 #if defined(HAVE_KMEM_CACHE_T)
276 static kmem_cache_t *afs_inode_cachep;
278 struct kmem_cache *afs_inode_cachep;
281 static struct inode *
282 afs_alloc_inode(struct super_block *sb)
286 #if defined(SLAB_KERNEL)
287 vcp = (struct vcache *) kmem_cache_alloc(afs_inode_cachep, SLAB_KERNEL);
289 vcp = (struct vcache *) kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
298 afs_destroy_inode(struct inode *inode)
300 kmem_cache_free(afs_inode_cachep, inode);
304 #if defined(HAVE_KMEM_CACHE_T)
305 init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
307 #if defined(KMEM_CACHE_INIT)
308 init_once(struct kmem_cache * cachep, void * foo)
310 init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
314 struct vcache *vcp = (struct vcache *) foo;
316 #if defined(SLAB_CTOR_VERIFY)
317 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
318 SLAB_CTOR_CONSTRUCTOR)
320 inode_init_once(AFSTOV(vcp));
324 afs_init_inodecache(void)
326 #ifndef SLAB_RECLAIM_ACCOUNT
327 #define SLAB_RECLAIM_ACCOUNT 0
330 #if defined(KMEM_CACHE_TAKES_DTOR)
331 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
332 sizeof(struct vcache),
333 0, SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT,
336 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
337 sizeof(struct vcache),
338 0, SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT,
341 if (afs_inode_cachep == NULL)
347 afs_destroy_inodecache(void)
349 if (afs_inode_cachep)
350 (void) kmem_cache_destroy(afs_inode_cachep);
354 afs_init_inodecache(void)
360 afs_destroy_inodecache(void)
367 afs_clear_inode(struct inode *ip)
369 struct vcache *vcp = VTOAFS(ip);
371 if (vcp->vlruq.prev || vcp->vlruq.next)
372 osi_Panic("inode freed while on LRU");
374 osi_Panic("inode freed while still hashed");
376 #if !defined(STRUCT_SUPER_HAS_ALLOC_INODE)
377 afs_osi_Free(ip->u.generic_ip, sizeof(struct vcache));
382 * Called from unmount to release super_block. */
384 afs_put_super(struct super_block *sbp)
387 AFS_STATCNT(afs_unmount);
389 #if !defined(AFS_LINUX26_ENV)
399 osi_linux_free_inode_pages(); /* invalidate and release remaining AFS inodes. */
401 #if defined(AFS_LINUX24_ENV)
402 mntput(afs_cacheMnt);
405 osi_linux_verify_alloced_memory();
406 #if defined(HAVE_BDI_INIT)
407 bdi_destroy(&afs_backing_dev_info);
412 #if defined(AFS_LINUX26_ENV)
413 module_put(THIS_MODULE);
421 * statp is in user space, so we need to cobble together a statfs, then
424 #if defined(AFS_LINUX26_ENV)
426 #if defined(STATFS_TAKES_DENTRY)
427 afs_statfs(struct dentry *dentry, struct kstatfs *statp)
429 afs_statfs(struct super_block *sbp, struct kstatfs *statp)
431 #elif defined(AFS_LINUX24_ENV)
433 afs_statfs(struct super_block *sbp, struct statfs *statp)
436 afs_statfs(struct super_block *sbp, struct statfs *__statp, int size)
439 #if !defined(AFS_LINUX24_ENV)
440 struct statfs stat, *statp;
442 if (size < sizeof(struct statfs))
445 memset(&stat, 0, size);
448 memset(statp, 0, sizeof(*statp));
451 AFS_STATCNT(afs_statfs);
453 /* hardcode in case that which is giveth is taken away */
454 statp->f_type = 0x5346414F;
455 #if defined(STATFS_TAKES_DENTRY)
456 statp->f_bsize = dentry->d_sb->s_blocksize;
458 statp->f_bsize = sbp->s_blocksize;
460 statp->f_blocks = statp->f_bfree = statp->f_bavail = statp->f_files =
461 statp->f_ffree = 9000000;
462 statp->f_fsid.val[0] = AFS_VFSMAGIC;
463 statp->f_fsid.val[1] = AFS_VFSFSID;
464 statp->f_namelen = 256;
466 #if !defined(AFS_LINUX24_ENV)
467 memcpy_tofs(__statp, &stat, size);
472 struct super_operations afs_sops = {
473 #if defined(STRUCT_SUPER_HAS_ALLOC_INODE)
474 .alloc_inode = afs_alloc_inode,
475 .destroy_inode = afs_destroy_inode,
477 .clear_inode = afs_clear_inode,
478 .put_super = afs_put_super,
479 .statfs = afs_statfs,
480 #if !defined(AFS_LINUX24_ENV)
481 .notify_change = afs_notify_change,
486 /************** Support routines ************************/
489 * Set iattr data into vattr. Assume vattr cleared before call.
492 iattr2vattr(struct vattr *vattrp, struct iattr *iattrp)
494 vattrp->va_mask = iattrp->ia_valid;
495 if (iattrp->ia_valid & ATTR_MODE)
496 vattrp->va_mode = iattrp->ia_mode;
497 if (iattrp->ia_valid & ATTR_UID)
498 vattrp->va_uid = iattrp->ia_uid;
499 if (iattrp->ia_valid & ATTR_GID)
500 vattrp->va_gid = iattrp->ia_gid;
501 if (iattrp->ia_valid & ATTR_SIZE)
502 vattrp->va_size = iattrp->ia_size;
503 if (iattrp->ia_valid & ATTR_ATIME) {
504 #if defined(AFS_LINUX26_ENV)
505 vattrp->va_atime.tv_sec = iattrp->ia_atime.tv_sec;
507 vattrp->va_atime.tv_sec = iattrp->ia_atime;
509 vattrp->va_atime.tv_usec = 0;
511 if (iattrp->ia_valid & ATTR_MTIME) {
512 #if defined(AFS_LINUX26_ENV)
513 vattrp->va_mtime.tv_sec = iattrp->ia_mtime.tv_sec;
515 vattrp->va_mtime.tv_sec = iattrp->ia_mtime;
517 vattrp->va_mtime.tv_usec = 0;
519 if (iattrp->ia_valid & ATTR_CTIME) {
520 #if defined(AFS_LINUX26_ENV)
521 vattrp->va_ctime.tv_sec = iattrp->ia_ctime.tv_sec;
523 vattrp->va_ctime.tv_sec = iattrp->ia_ctime;
525 vattrp->va_ctime.tv_usec = 0;
530 * Rewrite the inode cache from the attr. Assumes all vattr fields are valid.
533 vattr2inode(struct inode *ip, struct vattr *vp)
535 ip->i_ino = vp->va_nodeid;
536 ip->i_nlink = vp->va_nlink;
537 ip->i_blocks = vp->va_blocks;
538 #ifdef STRUCT_INODE_HAS_I_BLKBITS
539 ip->i_blkbits = AFS_BLKBITS;
541 #ifdef STRUCT_INODE_HAS_I_BLKSIZE
542 ip->i_blksize = vp->va_blocksize;
544 ip->i_rdev = vp->va_rdev;
545 ip->i_mode = vp->va_mode;
546 ip->i_uid = vp->va_uid;
547 ip->i_gid = vp->va_gid;
548 ip->i_size = vp->va_size;
549 #if defined(AFS_LINUX26_ENV)
550 ip->i_atime.tv_sec = vp->va_atime.tv_sec;
551 ip->i_atime.tv_nsec = 0;
552 ip->i_mtime.tv_sec = vp->va_mtime.tv_sec;
553 /* Set the mtime nanoseconds to the sysname generation number.
554 * This convinces NFS clients that all directories have changed
555 * any time the sysname list changes.
557 ip->i_mtime.tv_nsec = afs_sysnamegen;
558 ip->i_ctime.tv_sec = vp->va_ctime.tv_sec;
559 ip->i_ctime.tv_nsec = 0;
561 ip->i_atime = vp->va_atime.tv_sec;
562 ip->i_mtime = vp->va_mtime.tv_sec;
563 ip->i_ctime = vp->va_ctime.tv_sec;
567 /* osi_linux_free_inode_pages
569 * Free all vnodes remaining in the afs hash. Must be done before
570 * shutting down afs and freeing all memory.
573 osi_linux_free_inode_pages(void)
576 struct vcache *tvc, *nvc;
577 extern struct vcache *afs_vhashT[VCSIZE];
579 for (i = 0; i < VCSIZE; i++) {
580 for (tvc = afs_vhashT[i]; tvc; ) {
584 if (afs_FlushVCache(tvc, &slept)) /* slept always 0 for linux? */
585 printf("Failed to invalidate all pages on inode 0x%p\n", tvc);