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)
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.
63 #if defined(AFS_LINUX26_ENV)
64 struct backing_dev_info afs_backing_dev_info = {
65 .ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE,
71 * read the "super block" for AFS - roughly eguivalent to struct vfs.
72 * dev, covered, s_rd_only, s_dirt, and s_type will be set by read_super.
74 #if defined(AFS_LINUX26_ENV)
75 static struct super_block *
76 #ifdef GET_SB_HAS_STRUCT_VFSMOUNT
77 afs_get_sb(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data, struct vfsmount *mnt)
80 afs_get_sb(struct file_system_type *fs_type, int flags,
81 const char *dev_name, void *data)
84 #ifdef GET_SB_HAS_STRUCT_VFSMOUNT
85 return get_sb_nodev(fs_type, flags, data, afs_fill_super, mnt);
87 return get_sb_nodev(fs_type, flags, data, afs_fill_super);
92 struct file_system_type afs_fs_type = {
96 .kill_sb = kill_anon_super,
97 .fs_flags = FS_BINARY_MOUNTDATA,
99 #elif defined(AFS_LINUX24_ENV)
100 DECLARE_FSTYPE(afs_fs_type, "afs", afs_read_super, 0);
102 struct file_system_type afs_fs_type = {
103 "afs", /* name - used by mount operation. */
104 0, /* requires_dev - no for network filesystems. mount() will
105 * pass us an "unnamed" device. */
106 afs_read_super, /* wrapper to afs_mount */
107 NULL /* pointer to next file_system_type once registered. */
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)
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 static kmem_cache_t *afs_inode_cachep;
274 static struct inode *
275 afs_alloc_inode(struct super_block *sb)
279 vcp = (struct vcache *) kmem_cache_alloc(afs_inode_cachep, SLAB_KERNEL);
287 afs_destroy_inode(struct inode *inode)
289 kmem_cache_free(afs_inode_cachep, inode);
293 init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
295 struct vcache *vcp = (struct vcache *) foo;
297 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
298 SLAB_CTOR_CONSTRUCTOR)
299 inode_init_once(AFSTOV(vcp));
303 afs_init_inodecache(void)
305 #ifndef SLAB_RECLAIM_ACCOUNT
306 #define SLAB_RECLAIM_ACCOUNT 0
309 afs_inode_cachep = kmem_cache_create("afs_inode_cache",
310 sizeof(struct vcache),
311 0, SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT,
313 if (afs_inode_cachep == NULL)
319 afs_destroy_inodecache(void)
321 if (kmem_cache_destroy(afs_inode_cachep))
322 printk(KERN_INFO "afs_inode_cache: not all structures were freed\n");
326 afs_init_inodecache(void)
332 afs_destroy_inodecache(void)
339 afs_clear_inode(struct inode *ip)
341 struct vcache *vcp = VTOAFS(ip);
343 if (vcp->vlruq.prev || vcp->vlruq.next)
344 osi_Panic("inode freed while on LRU");
346 osi_Panic("inode freed while still hashed");
348 #if !defined(STRUCT_SUPER_HAS_ALLOC_INODE)
349 afs_osi_Free(ip->u.generic_ip, sizeof(struct vcache));
354 * Linux version of inactive. When refcount == 2, we are about to
355 * decrement to 1 and the only reference remaining should be for
360 afs_put_inode(struct inode *ip)
362 struct vcache *vcp = VTOAFS(ip);
365 if (VREFCOUNT(vcp) == 2)
366 afs_InactiveVCache(vcp, NULL);
371 * Called from unmount to release super_block. */
373 afs_put_super(struct super_block *sbp)
376 AFS_STATCNT(afs_unmount);
378 #if !defined(AFS_LINUX26_ENV)
388 osi_linux_free_inode_pages(); /* invalidate and release remaining AFS inodes. */
390 #if defined(AFS_LINUX24_ENV)
391 mntput(afs_cacheMnt);
394 osi_linux_verify_alloced_memory();
398 #if defined(AFS_LINUX26_ENV)
399 module_put(THIS_MODULE);
407 * statp is in user space, so we need to cobble together a statfs, then
410 #if defined(AFS_LINUX26_ENV)
412 afs_statfs(struct super_block *sbp, struct kstatfs *statp)
413 #elif defined(AFS_LINUX24_ENV)
415 afs_statfs(struct super_block *sbp, struct statfs *statp)
418 afs_statfs(struct super_block *sbp, struct statfs *__statp, int size)
421 #if !defined(AFS_LINUX24_ENV)
422 struct statfs stat, *statp;
424 if (size < sizeof(struct statfs))
427 memset(&stat, 0, size);
430 memset(statp, 0, sizeof(*statp));
433 AFS_STATCNT(afs_statfs);
435 statp->f_type = 0; /* Can we get a real type sometime? */
436 statp->f_bsize = sbp->s_blocksize;
437 statp->f_blocks = statp->f_bfree = statp->f_bavail = statp->f_files =
438 statp->f_ffree = 9000000;
439 statp->f_fsid.val[0] = AFS_VFSMAGIC;
440 statp->f_fsid.val[1] = AFS_VFSFSID;
441 statp->f_namelen = 256;
443 #if !defined(AFS_LINUX24_ENV)
444 memcpy_tofs(__statp, &stat, size);
449 struct super_operations afs_sops = {
450 #if defined(STRUCT_SUPER_HAS_ALLOC_INODE)
451 .alloc_inode = afs_alloc_inode,
452 .destroy_inode = afs_destroy_inode,
454 .clear_inode = afs_clear_inode,
455 .put_inode = afs_put_inode,
456 .put_super = afs_put_super,
457 .statfs = afs_statfs,
458 #if !defined(AFS_LINUX24_ENV)
459 .notify_change = afs_notify_change,
463 /************** Support routines ************************/
466 * Set iattr data into vattr. Assume vattr cleared before call.
469 iattr2vattr(struct vattr *vattrp, struct iattr *iattrp)
471 vattrp->va_mask = iattrp->ia_valid;
472 if (iattrp->ia_valid & ATTR_MODE)
473 vattrp->va_mode = iattrp->ia_mode;
474 if (iattrp->ia_valid & ATTR_UID)
475 vattrp->va_uid = iattrp->ia_uid;
476 if (iattrp->ia_valid & ATTR_GID)
477 vattrp->va_gid = iattrp->ia_gid;
478 if (iattrp->ia_valid & ATTR_SIZE)
479 vattrp->va_size = iattrp->ia_size;
480 if (iattrp->ia_valid & ATTR_ATIME) {
481 #if defined(AFS_LINUX26_ENV)
482 vattrp->va_atime.tv_sec = iattrp->ia_atime.tv_sec;
484 vattrp->va_atime.tv_sec = iattrp->ia_atime;
486 vattrp->va_atime.tv_usec = 0;
488 if (iattrp->ia_valid & ATTR_MTIME) {
489 #if defined(AFS_LINUX26_ENV)
490 vattrp->va_mtime.tv_sec = iattrp->ia_mtime.tv_sec;
492 vattrp->va_mtime.tv_sec = iattrp->ia_mtime;
494 vattrp->va_mtime.tv_usec = 0;
496 if (iattrp->ia_valid & ATTR_CTIME) {
497 #if defined(AFS_LINUX26_ENV)
498 vattrp->va_ctime.tv_sec = iattrp->ia_ctime.tv_sec;
500 vattrp->va_ctime.tv_sec = iattrp->ia_ctime;
502 vattrp->va_ctime.tv_usec = 0;
507 * Rewrite the inode cache from the attr. Assumes all vattr fields are valid.
510 vattr2inode(struct inode *ip, struct vattr *vp)
512 ip->i_ino = vp->va_nodeid;
513 ip->i_nlink = vp->va_nlink;
514 ip->i_blocks = vp->va_blocks;
515 ip->i_blksize = vp->va_blocksize;
516 ip->i_rdev = vp->va_rdev;
517 ip->i_mode = vp->va_mode;
518 ip->i_uid = vp->va_uid;
519 ip->i_gid = vp->va_gid;
520 ip->i_size = vp->va_size;
521 #if defined(AFS_LINUX26_ENV)
522 ip->i_atime.tv_sec = vp->va_atime.tv_sec;
523 ip->i_mtime.tv_sec = vp->va_mtime.tv_sec;
524 /* Set the mtime nanoseconds to the sysname generation number.
525 * This convinces NFS clients that all directories have changed
526 * any time the sysname list changes.
528 ip->i_mtime.tv_nsec = afs_sysnamegen;
529 ip->i_ctime.tv_sec = vp->va_ctime.tv_sec;
531 ip->i_atime = vp->va_atime.tv_sec;
532 ip->i_mtime = vp->va_mtime.tv_sec;
533 ip->i_ctime = vp->va_ctime.tv_sec;
537 /* osi_linux_free_inode_pages
539 * Free all vnodes remaining in the afs hash. Must be done before
540 * shutting down afs and freeing all memory.
543 osi_linux_free_inode_pages(void)
546 struct vcache *tvc, *nvc;
547 extern struct vcache *afs_vhashT[VCSIZE];
549 for (i = 0; i < VCSIZE; i++) {
550 for (tvc = afs_vhashT[i]; tvc; ) {
554 if (afs_FlushVCache(tvc, &slept)) /* slept always 0 for linux? */
555 printf("Failed to invalidate all pages on inode 0x%p\n", tvc);