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");
86 /* Set basics of super_block */
87 #if !defined(AFS_LINUX24_ENV)
93 sb->s_blocksize = 1024;
94 sb->s_blocksize_bits = 10;
95 sb->s_magic = AFS_VFSMAGIC;
96 sb->s_op = &afs_sops; /* Super block (vfs) ops */
97 #if defined(MAX_NON_LFS)
98 sb->s_maxbytes = MAX_NON_LFS;
104 #if !defined(AFS_LINUX24_ENV)
109 return code ? NULL : sb;
113 /* afs_root - stat the root of the file system. AFS global held on entry. */
114 static int afs_root(struct super_block *afsp)
116 register afs_int32 code = 0;
117 struct vrequest treq;
118 register struct vcache *tvp=0;
120 AFS_STATCNT(afs_root);
121 if (afs_globalVp && (afs_globalVp->states & CStatd)) {
124 cred_t *credp = crref();
126 if (!(code = afs_InitReq(&treq, credp)) &&
127 !(code = afs_CheckInit())) {
128 tvp = afs_GetVCache(&afs_rootFid, &treq, (afs_int32 *)0,
129 (struct vcache*)0, WRITE_LOCK);
131 extern struct inode_operations afs_dir_iops;
132 #if defined(AFS_LINUX24_ENV)
133 extern struct file_operations afs_dir_fops;
136 /* "/afs" is a directory, reset inode ops accordingly. */
137 AFSTOV(tvp)->v_op = &afs_dir_iops;
138 #if defined(AFS_LINUX24_ENV)
139 AFSTOV(tvp)->v_fop = &afs_dir_fops;
142 /* setup super_block and mount point inode. */
144 #if defined(AFS_LINUX24_ENV)
145 afsp->s_root = d_alloc_root(AFSTOI(tvp));
147 afsp->s_root = d_alloc_root(AFSTOI(tvp), NULL);
149 afsp->s_root->d_op = &afs_dentry_operations;
156 afs_Trace2(afs_iclSetp, CM_TRACE_VFSROOT, ICL_TYPE_POINTER, afs_globalVp,
157 ICL_TYPE_INT32, code);
161 /* super_operations */
164 * called via iget to read in the inode. The passed in inode has i_ino, i_dev
165 * and i_sb setup on input. Linux file systems use this to get super block
166 * inode information, so we don't really care what happens here.
167 * For Linux 2.2, we'll be called if we participate in the inode pool.
169 void afs_read_inode(struct inode *ip)
171 /* I don't think we ever get called with this. So print if we do. */
172 printf("afs_read_inode: Called for inode %d\n", ip->i_ino);
177 * Linux version of setattr call. What to change is in the iattr struct.
178 * We need to set bits in both the Linux inode as well as the vcache.
180 int afs_notify_change(struct dentry *dp, struct iattr* iattrp)
184 cred_t *credp = crref();
185 struct inode *ip = dp->d_inode;
189 iattr2vattr(&vattr, iattrp); /* Convert for AFS vnodeops call. */
190 update_inode_cache(ip, &vattr);
191 code = afs_setattr(ITOAFS(ip), &vattr, credp);
192 afs_CopyOutAttrs(ITOAFS(ip), &vattr);
193 /* Note that the inode may still not have all the correct info. But at
194 * least we've got the newest version of what was supposed to be set.
203 /* This list is simply used to initialize the i_list member of the
204 * linux inode. This stops linux inode syncing code from choking on our
207 static LIST_HEAD(dummy_inode_list);
210 /* This is included for documentation only. */
212 * Used to flush in core inode to disk. We don't need to do this. Top level
213 * write_inode() routine will clear i_dirt. If this routine is in the table,
214 * it's expected to do the cleaning and clear i_dirt.
216 * 9/24/99: This is what we thought until we discovered msync() does end up calling
217 * this function to sync a single inode to disk. msync() only flushes selective
218 * pages to disk. So it needs an inode syncing function to update metadata when it
219 * has synced some pages of a file to disk.
221 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
222 void afs_write_inode(struct inode *ip, int unused)
224 void afs_write_inode(struct inode *ip)
227 /* and put it back on our dummy list. */
228 list_del(&ip->i_list);
229 list_add(&ip->i_list, &dummy_inode_list);
231 /* for now we don't actually update the metadata during msync. This
232 * is just to keep linux happy. */
237 * called from iput when count goes to zero. Linux version of inactive.
238 * For Linux 2.2, this funcionality has moved to the delete inode super op.
239 * If we use the common inode pool, we'll need to set i_nlink to 0 here.
240 * That will trigger the call to delete routine.
243 void afs_delete_inode(struct inode *ip)
245 struct vcache *vc = ITOAFS(ip);
254 * Called from unmount to release super_block. */
255 void afs_put_super(struct super_block *sbp)
257 extern int afs_afs_cold_shutdown;
262 AFS_STATCNT(afs_unmount);
273 osi_linux_verify_alloced_memory();
285 * Not required since we don't write out a super block. */
286 void afs_write_super(struct super_block *sbp)
291 * Used to remount filesystems with different flags. Not relevant for AFS.
293 int afs_remount_fs(struct super_block *sbp, int *, char *)
300 * statp is in user space, so we need to cobble together a statfs, then
303 #if defined(AFS_LINUX24_ENV)
304 int afs_statfs(struct super_block *sbp, struct statfs *statp)
306 int afs_statfs(struct super_block *sbp, struct statfs *statp, int size)
311 AFS_STATCNT(afs_statfs);
313 #if !defined(AFS_LINUX24_ENV)
314 if (size < sizeof(struct statfs))
317 memset(&stat, 0, size);
319 stat.f_type = 0; /* Can we get a real type sometime? */
320 stat.f_bsize = sbp->s_blocksize;
321 stat.f_blocks = stat.f_bfree = stat.f_bavail = stat.f_files =
322 stat.f_ffree = 9000000;
323 stat.f_fsid.val[0] = AFS_VFSMAGIC;
324 stat.f_fsid.val[1] = AFS_VFSFSID;
325 stat.f_namelen = 256;
327 #if defined(AFS_LINUX24_ENV)
330 memcpy_tofs(statp, &stat, size);
337 afs_umount_begin(struct super_block *sbp)
344 #if defined(AFS_LINUX24_ENV)
345 struct super_operations afs_sops = {
346 read_inode: afs_read_inode,
347 write_inode: afs_write_inode,
348 delete_inode: afs_delete_inode,
349 put_super: afs_put_super,
351 umount_begin: NULL /* afs_umount_begin */
354 struct super_operations afs_sops = {
356 afs_write_inode, /* afs_write_inode - see doc above. */
357 NULL, /* afs_put_inode */
361 NULL, /* afs_write_super - see doc above */
363 NULL, /* afs_remount_fs - see doc above */
364 NULL, /* afs_clear_inode */
365 NULL /* afs_umount_begin */
369 /************** Support routines ************************/
372 * Set iattr data into vattr. Assume vattr cleared before call.
374 static void iattr2vattr(struct vattr *vattrp, struct iattr *iattrp)
376 vattrp->va_mask = iattrp->ia_valid;
377 if (iattrp->ia_valid & ATTR_MODE)
378 vattrp->va_mode = iattrp->ia_mode;
379 if (iattrp->ia_valid & ATTR_UID)
380 vattrp->va_uid = iattrp->ia_uid;
381 if (iattrp->ia_valid & ATTR_GID)
382 vattrp->va_gid = iattrp->ia_gid;
383 if (iattrp->ia_valid & ATTR_SIZE)
384 vattrp->va_size = iattrp->ia_size;
385 if (iattrp->ia_valid & ATTR_ATIME) {
386 vattrp->va_atime.tv_sec = iattrp->ia_atime;
387 vattrp->va_atime.tv_usec = 0;
389 if (iattrp->ia_valid & ATTR_MTIME) {
390 vattrp->va_mtime.tv_sec = iattrp->ia_mtime;
391 vattrp->va_mtime.tv_usec = 0;
393 if (iattrp->ia_valid & ATTR_CTIME) {
394 vattrp->va_ctime.tv_sec = iattrp->ia_ctime;
395 vattrp->va_ctime.tv_usec = 0;
399 /* update_inode_cache
400 * Update inode with info from vattr struct. Use va_mask to determine what
403 static void update_inode_cache(struct inode *ip, struct vattr *vp)
405 if (vp->va_mask & ATTR_MODE)
406 ip->i_mode = vp->va_mode;
407 if (vp->va_mask & ATTR_UID)
408 ip->i_uid = vp->va_uid;
409 if (vp->va_mask & ATTR_GID)
410 ip->i_gid = vp->va_gid;
411 if (vp->va_mask & ATTR_SIZE)
412 ip->i_size = vp->va_size;
413 if (vp->va_mask & ATTR_ATIME)
414 ip->i_atime = vp->va_atime.tv_sec;
415 if (vp->va_mask & ATTR_MTIME)
416 ip->i_mtime = vp->va_mtime.tv_sec;
417 if (vp->va_mask & ATTR_CTIME)
418 ip->i_ctime = vp->va_ctime.tv_sec;
422 * Rewrite the inode cache from the attr. Assumes all vattr fields are valid.
424 void vattr2inode(struct inode *ip, struct vattr *vp)
426 ip->i_ino = vp->va_nodeid;
427 ip->i_nlink = vp->va_nlink;
428 ip->i_blocks = vp->va_blocks;
429 ip->i_blksize = vp->va_blocksize;
430 ip->i_rdev = vp->va_rdev;
431 ip->i_mode = vp->va_mode;
432 ip->i_uid = vp->va_uid;
433 ip->i_gid = vp->va_gid;
434 ip->i_size = vp->va_size;
435 ip->i_atime = vp->va_atime.tv_sec;
436 ip->i_mtime = vp->va_mtime.tv_sec;
437 ip->i_ctime = vp->va_ctime.tv_sec;
439 /* we should put our inodes on a dummy inode list to keep linux happy.*/
440 if (!ip->i_list.prev && !ip->i_list.next) {
441 /* this might be bad as we are reaching under the covers of the
442 * list structure but we want to avoid putting the inode
443 * on the list more than once. */
444 put_inode_on_dummy_list(ip);
448 /* Put this afs inode on our own dummy list. Linux expects to see inodes
449 * nicely strung up in lists. Linux inode syncing code chokes on our inodes if
450 * they're not on any lists.
452 void put_inode_on_dummy_list(struct inode *ip)
454 /* Initialize list. See explanation above. */
455 list_add(&ip->i_list, &dummy_inode_list);
458 /* And yet another routine to update the inode cache - called from ProcessFS */
459 void vcache2inode(struct vcache *avc)
464 afs_CopyOutAttrs(avc, &vattr); /* calls vattr2inode */
467 /* Yet another one for fakestat'ed mountpoints */
468 void vcache2fakeinode(struct vcache *rootvp, struct vcache *mpvp)
473 afs_CopyOutAttrs(rootvp, &vattr);
474 vattr2inode(AFSTOV(mpvp), &vattr);