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 extern afs_rwlock_t afs_xvcache;
43 extern struct afs_q VLRU;
45 extern struct dentry_operations afs_dentry_operations;
47 /* Forward declarations */
48 static void iattr2vattr(struct vattr *vattrp, struct iattr *iattrp);
49 static void update_inode_cache(struct inode *ip, struct vattr *vp);
50 static int afs_root(struct super_block *afsp);
51 struct super_block *afs_read_super(struct super_block *sb, void *data, int silent);
52 int afs_fill_super(struct super_block *sb, void *data, int silent);
53 static struct super_block *afs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data);
56 * VFS entry for Linux - installed in init_module
57 * Linux mounts file systems by:
58 * 1) register_filesystem(&afs_file_system) - done in init_module
59 * 2) Mount call comes to us via do_mount -> read_super -> afs_read_super.
60 * We are expected to setup the super_block. See afs_read_super.
62 #if defined(AFS_LINUX26_ENV)
63 struct backing_dev_info afs_backing_dev_info = {
64 .ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE,
68 struct file_system_type afs_fs_type = {
72 .kill_sb = kill_anon_super,
73 .fs_flags = FS_BINARY_MOUNTDATA,
75 #elif defined(AFS_LINUX24_ENV)
76 DECLARE_FSTYPE(afs_fs_type, "afs", afs_read_super, 0);
78 struct file_system_type afs_fs_type = {
79 "afs", /* name - used by mount operation. */
80 0, /* requires_dev - no for network filesystems. mount() will
81 * pass us an "unnamed" device. */
82 afs_read_super, /* wrapper to afs_mount */
83 NULL /* pointer to next file_system_type once registered. */
88 * read the "super block" for AFS - roughly eguivalent to struct vfs.
89 * dev, covered, s_rd_only, s_dirt, and s_type will be set by read_super.
91 #if defined(AFS_LINUX26_ENV)
92 static struct super_block *
93 afs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data)
95 return get_sb_nodev(fs_type, flags, data, afs_fill_super);
99 afs_fill_super(struct super_block *sb, void *data, int silent)
102 afs_read_super(struct super_block *sb, void *data, int silent)
108 if (afs_was_mounted) {
110 ("You must reload the AFS kernel extensions before remounting AFS.\n");
112 #if defined(AFS_LINUX26_ENV)
120 /* Set basics of super_block */
121 #if !defined(AFS_LINUX24_ENV)
124 #if defined(AFS_LINUX26_ENV)
125 __module_get(THIS_MODULE);
131 sb->s_blocksize = 1024;
132 sb->s_blocksize_bits = 10;
133 sb->s_magic = AFS_VFSMAGIC;
134 sb->s_op = &afs_sops; /* Super block (vfs) ops */
135 #if defined(MAX_NON_LFS)
136 sb->s_maxbytes = MAX_NON_LFS;
140 afs_globalVFS = NULL;
141 #if defined(AFS_LINUX26_ENV)
142 module_put(THIS_MODULE);
148 #if !defined(AFS_LINUX24_ENV)
153 #if defined(AFS_LINUX26_ENV)
154 return code ? -EINVAL : 0;
156 return code ? NULL : sb;
161 /* afs_root - stat the root of the file system. AFS global held on entry. */
163 afs_root(struct super_block *afsp)
165 register afs_int32 code = 0;
166 struct vrequest treq;
167 register struct vcache *tvp = 0;
169 AFS_STATCNT(afs_root);
170 if (afs_globalVp && (afs_globalVp->states & CStatd)) {
173 cred_t *credp = crref();
176 afs_PutVCache(afs_globalVp);
180 if (!(code = afs_InitReq(&treq, credp)) && !(code = afs_CheckInit())) {
181 tvp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
183 extern struct inode_operations afs_dir_iops;
184 #if defined(AFS_LINUX24_ENV)
185 extern struct file_operations afs_dir_fops;
188 /* "/afs" is a directory, reset inode ops accordingly. */
189 AFSTOV(tvp)->v_op = &afs_dir_iops;
190 #if defined(AFS_LINUX24_ENV)
191 AFSTOV(tvp)->v_fop = &afs_dir_fops;
194 /* setup super_block and mount point inode. */
196 #if defined(AFS_LINUX24_ENV)
197 afsp->s_root = d_alloc_root(AFSTOI(tvp));
199 afsp->s_root = d_alloc_root(AFSTOI(tvp), NULL);
201 afsp->s_root->d_op = &afs_dentry_operations;
208 afs_Trace2(afs_iclSetp, CM_TRACE_VFSROOT, ICL_TYPE_POINTER, afs_globalVp,
209 ICL_TYPE_INT32, code);
213 /* super_operations */
216 * Linux version of setattr call. What to change is in the iattr struct.
217 * We need to set bits in both the Linux inode as well as the vcache.
220 afs_notify_change(struct dentry *dp, struct iattr *iattrp)
224 cred_t *credp = crref();
225 struct inode *ip = dp->d_inode;
228 #if defined(AFS_LINUX26_ENV)
232 iattr2vattr(&vattr, iattrp); /* Convert for AFS vnodeops call. */
233 update_inode_cache(ip, &vattr);
234 code = afs_setattr(ITOAFS(ip), &vattr, credp);
235 afs_CopyOutAttrs(ITOAFS(ip), &vattr);
236 /* Note that the inode may still not have all the correct info. But at
237 * least we've got the newest version of what was supposed to be set.
240 #if defined(AFS_LINUX26_ENV)
249 /* This list is simply used to initialize the i_list member of the
250 * linux inode. This stops linux inode syncing code from choking on our
253 static LIST_HEAD(dummy_inode_list);
256 /* This is included for documentation only. */
258 * Used to flush in core inode to disk. We don't need to do this. Top level
259 * write_inode() routine will clear i_dirt. If this routine is in the table,
260 * it's expected to do the cleaning and clear i_dirt.
262 * 9/24/99: This is what we thought until we discovered msync() does end up calling
263 * this function to sync a single inode to disk. msync() only flushes selective
264 * pages to disk. So it needs an inode syncing function to update metadata when it
265 * has synced some pages of a file to disk.
267 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
268 #ifdef WRITE_INODE_NOT_VOID
273 afs_write_inode(struct inode *ip, int unused)
276 afs_write_inode(struct inode *ip)
279 list_del(&ip->i_list);
280 /* and put it back on our dummy list. */
281 put_inode_on_dummy_list(ip);
283 /* for now we don't actually update the metadata during msync. This
284 * is just to keep linux happy. */
285 #ifdef WRITE_INODE_NOT_VOID
291 afs_destroy_inode(struct inode *ip)
293 cred_t *credp = crref();
295 /* locked by clear_inode() */
296 put_inode_on_dummy_list(ip);
298 afs_InactiveVCache(ITOAFS(ip), credp); /* afs_FlushVCache()? */
305 * called from iput when count goes to zero. Linux version of inactive.
306 * For Linux 2.2, this funcionality has moved to the delete inode super op.
307 * If we use the common inode pool, we'll need to set i_nlink to 0 here.
308 * That will trigger the call to delete routine.
311 #if defined(AFS_LINUX24_ENV)
313 afs_clear_inode(struct inode *ip)
315 AFS_GLOCK(); /* unlocked by destroy_inode() */
319 afs_delete_inode(struct inode *ip)
321 AFS_GLOCK(); /* after spin_unlock(inode_lock) */
328 * Called from unmount to release super_block. */
330 afs_put_super(struct super_block *sbp)
335 AFS_STATCNT(afs_unmount);
337 #if !defined(AFS_LINUX26_ENV)
347 #if defined(AFS_LINUX24_ENV)
348 mntput(afs_cacheMnt);
351 osi_linux_verify_alloced_memory();
356 #if defined(AFS_LINUX26_ENV)
357 module_put(THIS_MODULE);
366 * statp is in user space, so we need to cobble together a statfs, then
369 #if defined(AFS_LINUX26_ENV)
371 afs_statfs(struct super_block *sbp, struct kstatfs *statp)
372 #elif defined(AFS_LINUX24_ENV)
374 afs_statfs(struct super_block *sbp, struct statfs *statp)
377 afs_statfs(struct super_block *sbp, struct statfs *__statp, int size)
380 #if !defined(AFS_LINUX24_ENV)
381 struct statfs stat, *statp;
383 if (size < sizeof(struct statfs))
386 memset(&stat, 0, size);
389 memset(statp, 0, sizeof(*statp));
392 AFS_STATCNT(afs_statfs);
394 statp->f_type = 0; /* Can we get a real type sometime? */
395 statp->f_bsize = sbp->s_blocksize;
396 statp->f_blocks = statp->f_bfree = statp->f_bavail = statp->f_files =
397 statp->f_ffree = 9000000;
398 statp->f_fsid.val[0] = AFS_VFSMAGIC;
399 statp->f_fsid.val[1] = AFS_VFSFSID;
400 statp->f_namelen = 256;
402 #if !defined(AFS_LINUX24_ENV)
403 memcpy_tofs(__statp, &stat, size);
409 afs_umount_begin(struct super_block *sbp)
411 afs_shuttingdown = 1;
414 struct super_operations afs_sops = {
415 #if defined(AFS_LINUX24_ENV)
416 .destroy_inode = afs_destroy_inode,
417 .clear_inode = afs_clear_inode,
419 .delete_inode = afs_delete_inode,
421 .write_inode = afs_write_inode,
422 .put_super = afs_put_super,
423 .statfs = afs_statfs,
424 .umount_begin = afs_umount_begin
425 #if !defined(AFS_LINUX24_ENV)
426 .notify_change = afs_notify_change,
430 /************** Support routines ************************/
433 * Set iattr data into vattr. Assume vattr cleared before call.
436 iattr2vattr(struct vattr *vattrp, struct iattr *iattrp)
438 vattrp->va_mask = iattrp->ia_valid;
439 if (iattrp->ia_valid & ATTR_MODE)
440 vattrp->va_mode = iattrp->ia_mode;
441 if (iattrp->ia_valid & ATTR_UID)
442 vattrp->va_uid = iattrp->ia_uid;
443 if (iattrp->ia_valid & ATTR_GID)
444 vattrp->va_gid = iattrp->ia_gid;
445 if (iattrp->ia_valid & ATTR_SIZE)
446 vattrp->va_size = iattrp->ia_size;
447 if (iattrp->ia_valid & ATTR_ATIME) {
448 #if defined(AFS_LINUX26_ENV)
449 vattrp->va_atime.tv_sec = iattrp->ia_atime.tv_sec;
451 vattrp->va_atime.tv_sec = iattrp->ia_atime;
453 vattrp->va_atime.tv_usec = 0;
455 if (iattrp->ia_valid & ATTR_MTIME) {
456 #if defined(AFS_LINUX26_ENV)
457 vattrp->va_mtime.tv_sec = iattrp->ia_mtime.tv_sec;
459 vattrp->va_mtime.tv_sec = iattrp->ia_mtime;
461 vattrp->va_mtime.tv_usec = 0;
463 if (iattrp->ia_valid & ATTR_CTIME) {
464 #if defined(AFS_LINUX26_ENV)
465 vattrp->va_ctime.tv_sec = iattrp->ia_ctime.tv_sec;
467 vattrp->va_ctime.tv_sec = iattrp->ia_ctime;
469 vattrp->va_ctime.tv_usec = 0;
473 /* update_inode_cache
474 * Update inode with info from vattr struct. Use va_mask to determine what
478 update_inode_cache(struct inode *ip, struct vattr *vp)
480 if (vp->va_mask & ATTR_MODE)
481 ip->i_mode = vp->va_mode;
482 if (vp->va_mask & ATTR_UID)
483 ip->i_uid = vp->va_uid;
484 if (vp->va_mask & ATTR_GID)
485 ip->i_gid = vp->va_gid;
486 if (vp->va_mask & ATTR_SIZE)
487 ip->i_size = vp->va_size;
488 if (vp->va_mask & ATTR_ATIME)
489 #if defined(AFS_LINUX26_ENV)
490 ip->i_atime.tv_sec = vp->va_atime.tv_sec;
492 ip->i_atime = vp->va_atime.tv_sec;
494 if (vp->va_mask & ATTR_MTIME)
495 #if defined(AFS_LINUX26_ENV)
496 ip->i_mtime.tv_sec = vp->va_mtime.tv_sec;
498 ip->i_mtime = vp->va_mtime.tv_sec;
500 if (vp->va_mask & ATTR_CTIME)
501 #if defined(AFS_LINUX26_ENV)
502 ip->i_ctime.tv_sec = vp->va_ctime.tv_sec;
504 ip->i_ctime = vp->va_ctime.tv_sec;
509 * Rewrite the inode cache from the attr. Assumes all vattr fields are valid.
512 vattr2inode(struct inode *ip, struct vattr *vp)
514 ip->i_ino = vp->va_nodeid;
515 ip->i_nlink = vp->va_nlink;
516 ip->i_blocks = vp->va_blocks;
517 ip->i_blksize = vp->va_blocksize;
518 ip->i_rdev = vp->va_rdev;
519 ip->i_mode = vp->va_mode;
520 ip->i_uid = vp->va_uid;
521 ip->i_gid = vp->va_gid;
522 ip->i_size = vp->va_size;
523 #if defined(AFS_LINUX26_ENV)
524 ip->i_atime.tv_sec = vp->va_atime.tv_sec;
525 ip->i_mtime.tv_sec = vp->va_mtime.tv_sec;
526 ip->i_ctime.tv_sec = vp->va_ctime.tv_sec;
528 ip->i_atime = vp->va_atime.tv_sec;
529 ip->i_mtime = vp->va_mtime.tv_sec;
530 ip->i_ctime = vp->va_ctime.tv_sec;
534 /* Put this afs inode on our own dummy list. Linux expects to see inodes
535 * nicely strung up in lists. Linux inode syncing code chokes on our inodes if
536 * they're not on any lists.
539 put_inode_on_dummy_list(struct inode *ip)
541 /* Initialize list. See explanation above. */
542 list_add(&ip->i_list, &dummy_inode_list);
545 /* And yet another routine to update the inode cache - called from ProcessFS */
547 vcache2inode(struct vcache *avc)
552 afs_CopyOutAttrs(avc, &vattr); /* calls vattr2inode */
555 /* Yet another one for fakestat'ed mountpoints */
557 vcache2fakeinode(struct vcache *rootvp, struct vcache *mpvp)
562 afs_CopyOutAttrs(rootvp, &vattr);
563 vattr2inode(AFSTOI(mpvp), &vattr);