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"
20 #include "../afs/sysincludes.h"
21 #include "../afs/afsincludes.h"
22 #include "../afs/afs_stats.h"
23 #include "../h/locks.h"
24 #if defined(AFS_LINUX24_ENV)
25 #include "../h/smp_lock.h"
28 #define __NO_VERSION__ /* don't define kernel_verion in module.h */
29 #include <linux/module.h>
32 struct vcache *afs_globalVp = 0;
33 struct vfs *afs_globalVFS = 0;
34 int afs_was_mounted = 0; /* Used to force reload if mount/unmount/mount */
36 extern struct super_operations afs_sops;
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 void update_inode_cache(struct inode *ip, struct vattr *vp);
45 static int afs_root(struct super_block *afsp);
46 struct super_block *afs_read_super(struct super_block *sb, void *data,
48 void put_inode_on_dummy_list(struct inode *ip);
51 * VFS entry for Linux - installed in init_module
52 * Linux mounts file systems by:
53 * 1) register_filesystem(&afs_file_system) - done in init_module
54 * 2) Mount call comes to us via do_mount -> read_super -> afs_read_super.
55 * We are expected to setup the super_block. See afs_read_super.
57 #if defined(AFS_LINUX24_ENV)
58 DECLARE_FSTYPE(afs_file_system, "afs", afs_read_super, 0);
60 struct file_system_type afs_file_system = {
61 "afs", /* name - used by mount operation. */
62 0, /* requires_dev - no for network filesystems. mount() will
63 * pass us an "unnamed" device. */
64 afs_read_super, /* wrapper to afs_mount */
65 NULL /* pointer to next file_system_type once registered. */
70 * read the "super block" for AFS - roughly eguivalent to struct vfs.
71 * dev, covered, s_rd_only, s_dirt, and s_type will be set by read_super.
73 struct super_block *afs_read_super(struct super_block *sb, void *data,
79 if (afs_was_mounted) {
80 printf("You must reload the AFS kernel extensions before remounting AFS.\n");
85 /* Set basics of super_block */
86 #if !defined(AFS_LINUX24_ENV)
92 sb->s_blocksize = 1024;
93 sb->s_blocksize_bits = 10;
94 sb->s_magic = AFS_VFSMAGIC;
95 sb->s_op = &afs_sops; /* Super block (vfs) ops */
96 #if defined(MAX_NON_LFS)
97 sb->s_maxbytes = MAX_NON_LFS;
103 #if !defined(AFS_LINUX24_ENV)
108 return code ? NULL : sb;
112 /* afs_root - stat the root of the file system. AFS global held on entry. */
113 static int afs_root(struct super_block *afsp)
115 register afs_int32 code = 0;
116 struct vrequest treq;
117 register struct vcache *tvp=0;
119 AFS_STATCNT(afs_root);
120 if (afs_globalVp && (afs_globalVp->states & CStatd)) {
123 cred_t *credp = crref();
125 if (!(code = afs_InitReq(&treq, credp)) &&
126 !(code = afs_CheckInit())) {
127 tvp = afs_GetVCache(&afs_rootFid, &treq, (afs_int32 *)0,
128 (struct vcache*)0, WRITE_LOCK);
130 extern struct inode_operations afs_dir_iops;
131 #if defined(AFS_LINUX24_ENV)
132 extern struct file_operations afs_dir_fops;
135 /* "/afs" is a directory, reset inode ops accordingly. */
136 tvp->v.v_op = &afs_dir_iops;
137 #if defined(AFS_LINUX24_ENV)
138 tvp->v.v_fop = &afs_dir_fops;
141 /* setup super_block and mount point inode. */
143 #if defined(AFS_LINUX24_ENV)
144 afsp->s_root = d_alloc_root((struct inode*)&tvp->v);
146 afsp->s_root = d_alloc_root((struct inode*)tvp, NULL);
148 afsp->s_root->d_op = &afs_dentry_operations;
155 afs_Trace2(afs_iclSetp, CM_TRACE_VFSROOT, ICL_TYPE_POINTER, afs_globalVp,
156 ICL_TYPE_INT32, code);
160 /* super_operations */
163 * called via iget to read in the inode. The passed in inode has i_ino, i_dev
164 * and i_sb setup on input. Linux file systems use this to get super block
165 * inode information, so we don't really care what happens here.
166 * For Linux 2.2, we'll be called if we participate in the inode pool.
168 void afs_read_inode(struct inode *ip)
170 /* I don't think we ever get called with this. So print if we do. */
171 printf("afs_read_inode: Called for inode %d\n", ip->i_ino);
176 * Linux version of setattr call. What to change is in the iattr struct.
177 * We need to set bits in both the Linux inode as well as the vcache.
179 int afs_notify_change(struct dentry *dp, struct iattr* iattrp)
183 cred_t *credp = crref();
184 struct inode *ip = dp->d_inode;
188 iattr2vattr(&vattr, iattrp); /* Convert for AFS vnodeops call. */
189 update_inode_cache(ip, &vattr);
190 code = afs_setattr((struct vcache*)ip, &vattr, credp);
191 afs_CopyOutAttrs((struct vcache*)ip, &vattr);
192 /* Note that the inode may still not have all the correct info. But at
193 * least we've got the newest version of what was supposed to be set.
202 /* This list is simply used to initialize the i_list member of the
203 * linux inode. This stops linux inode syncing code from choking on our
206 static LIST_HEAD(dummy_inode_list);
209 /* This is included for documentation only. */
211 * Used to flush in core inode to disk. We don't need to do this. Top level
212 * write_inode() routine will clear i_dirt. If this routine is in the table,
213 * it's expected to do the cleaning and clear i_dirt.
215 * 9/24/99: This is what we thought until we discovered msync() does end up calling
216 * this function to sync a single inode to disk. msync() only flushes selective
217 * pages to disk. So it needs an inode syncing function to update metadata when it
218 * has synced some pages of a file to disk.
220 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
221 void afs_write_inode(struct inode *ip, int unused)
223 void afs_write_inode(struct inode *ip)
226 /* and put it back on our dummy list. */
227 list_del(&ip->i_list);
228 list_add(&ip->i_list, &dummy_inode_list);
230 /* for now we don't actually update the metadata during msync. This
231 * is just to keep linux happy. */
236 * called from iput when count goes to zero. Linux version of inactive.
237 * For Linux 2.2, this funcionality has moved to the delete inode super op.
238 * If we use the common inode pool, we'll need to set i_nlink to 0 here.
239 * That will trigger the call to delete routine.
242 void afs_delete_inode(struct inode *ip)
244 struct vcache *vc = (struct vcache*)ip;
253 * Called from unmount to release super_block. */
254 void afs_put_super(struct super_block *sbp)
256 extern int afs_afs_cold_shutdown;
261 AFS_STATCNT(afs_unmount);
272 osi_linux_verify_alloced_memory();
284 * Not required since we don't write out a super block. */
285 void afs_write_super(struct super_block *sbp)
290 * Used to remount filesystems with different flags. Not relevant for AFS.
292 int afs_remount_fs(struct super_block *sbp, int *, char *)
299 * statp is in user space, so we need to cobble together a statfs, then
302 #if defined(AFS_LINUX24_ENV)
303 int afs_statfs(struct super_block *sbp, struct statfs *statp)
305 int afs_statfs(struct super_block *sbp, struct statfs *statp, int size)
310 AFS_STATCNT(afs_statfs);
312 #if !defined(AFS_LINUX24_ENV)
313 if (size < sizeof(struct statfs))
316 memset(&stat, 0, size);
318 stat.f_type = 0; /* Can we get a real type sometime? */
319 stat.f_bsize = sbp->s_blocksize;
320 stat.f_blocks = stat.f_bfree = stat.f_bavail = stat.f_files =
321 stat.f_ffree = 9000000;
322 stat.f_fsid.val[0] = AFS_VFSMAGIC;
323 stat.f_fsid.val[1] = AFS_VFSFSID;
324 stat.f_namelen = 256;
326 #if defined(AFS_LINUX24_ENV)
329 memcpy_tofs(statp, &stat, size);
336 afs_umount_begin(struct super_block *sbp)
343 #if defined(AFS_LINUX24_ENV)
344 struct super_operations afs_sops = {
345 read_inode: afs_read_inode,
346 write_inode: afs_write_inode,
347 delete_inode: afs_delete_inode,
348 put_super: afs_put_super,
350 umount_begin: afs_umount_begin,
353 struct super_operations afs_sops = {
355 afs_write_inode, /* afs_write_inode - see doc above. */
356 NULL, /* afs_put_inode */
360 NULL, /* afs_write_super - see doc above */
362 NULL, /* afs_remount_fs - see doc above */
363 NULL, /* afs_clear_inode */
368 /************** Support routines ************************/
371 * Set iattr data into vattr. Assume vattr cleared before call.
373 static void iattr2vattr(struct vattr *vattrp, struct iattr *iattrp)
375 vattrp->va_mask = iattrp->ia_valid;
376 if (iattrp->ia_valid & ATTR_MODE)
377 vattrp->va_mode = iattrp->ia_mode;
378 if (iattrp->ia_valid & ATTR_UID)
379 vattrp->va_uid = iattrp->ia_uid;
380 if (iattrp->ia_valid & ATTR_GID)
381 vattrp->va_gid = iattrp->ia_gid;
382 if (iattrp->ia_valid & ATTR_SIZE)
383 vattrp->va_size = iattrp->ia_size;
384 if (iattrp->ia_valid & ATTR_ATIME) {
385 vattrp->va_atime.tv_sec = iattrp->ia_atime;
386 vattrp->va_atime.tv_usec = 0;
388 if (iattrp->ia_valid & ATTR_MTIME) {
389 vattrp->va_mtime.tv_sec = iattrp->ia_mtime;
390 vattrp->va_mtime.tv_usec = 0;
392 if (iattrp->ia_valid & ATTR_CTIME) {
393 vattrp->va_ctime.tv_sec = iattrp->ia_ctime;
394 vattrp->va_ctime.tv_usec = 0;
398 /* update_inode_cache
399 * Update inode with info from vattr struct. Use va_mask to determine what
402 static void update_inode_cache(struct inode *ip, struct vattr *vp)
404 if (vp->va_mask & ATTR_MODE)
405 ip->i_mode = vp->va_mode;
406 if (vp->va_mask & ATTR_UID)
407 ip->i_uid = vp->va_uid;
408 if (vp->va_mask & ATTR_GID)
409 ip->i_gid = vp->va_gid;
410 if (vp->va_mask & ATTR_SIZE)
411 ip->i_size = vp->va_size;
412 if (vp->va_mask & ATTR_ATIME)
413 ip->i_atime = vp->va_atime.tv_sec;
414 if (vp->va_mask & ATTR_MTIME)
415 ip->i_mtime = vp->va_mtime.tv_sec;
416 if (vp->va_mask & ATTR_CTIME)
417 ip->i_ctime = vp->va_ctime.tv_sec;
421 * Rewrite the inode cache from the attr. Assumes all vattr fields are valid.
423 void vattr2inode(struct inode *ip, struct vattr *vp)
425 ip->i_ino = vp->va_nodeid;
426 ip->i_nlink = vp->va_nlink;
427 ip->i_blocks = vp->va_blocks;
428 ip->i_blksize = vp->va_blocksize;
429 ip->i_rdev = vp->va_rdev;
430 ip->i_mode = vp->va_mode;
431 ip->i_uid = vp->va_uid;
432 ip->i_gid = vp->va_gid;
433 ip->i_size = vp->va_size;
434 ip->i_atime = vp->va_atime.tv_sec;
435 ip->i_mtime = vp->va_mtime.tv_sec;
436 ip->i_ctime = vp->va_ctime.tv_sec;
438 /* we should put our inodes on a dummy inode list to keep linux happy.*/
439 if (!ip->i_list.prev && !ip->i_list.next) {
440 /* this might be bad as we are reaching under the covers of the
441 * list structure but we want to avoid putting the inode
442 * on the list more than once. */
443 put_inode_on_dummy_list(ip);
447 /* Put this afs inode on our own dummy list. Linux expects to see inodes
448 * nicely strung up in lists. Linux inode syncing code chokes on our inodes if
449 * they're not on any lists.
451 void put_inode_on_dummy_list(struct inode *ip)
453 /* Initialize list. See explanation above. */
454 list_add(&ip->i_list, &dummy_inode_list);
457 /* And yet another routine to update the inode cache - called from ProcessFS */
458 void vcache2inode(struct vcache *avc)
463 afs_CopyOutAttrs(avc, &vattr); /* calls vattr2inode */