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 * Linux support routines.
14 #include "../afs/param.h"
15 #include "../afs/sysincludes.h"
16 #include "../afs/afsincludes.h"
17 #include "../afs/afs_stats.h"
19 char *crash_addr = 0; /* Induce an oops by writing here. */
21 /* Lookup name and return vnode for same. */
22 int osi_lookupname(char *aname, uio_seg_t seg, int followlink,
23 vnode_t **dirvpp, struct dentry **dpp)
25 #if defined(AFS_LINUX24_ENV)
28 struct dentry *dp = NULL;
33 #if defined(AFS_LINUX24_ENV)
34 if (seg == AFS_UIOUSER) {
36 user_path_walk(aname, &nd) : user_path_walk_link(aname, &nd);
39 if (path_init(aname, followlink ? LOOKUP_FOLLOW : 0, &nd))
40 code = path_walk(aname, &nd);
44 if (nd.dentry->d_inode) {
52 if (seg == AFS_UIOUSER) {
53 dp = followlink ? namei(aname) : lnamei(aname);
56 dp = lookup_dentry(aname, NULL, followlink ? 1 : 0);
59 if (dp && !IS_ERR(dp)) {
72 /* Intialize cache device info and fragment size for disk cache partition. */
73 int osi_InitCacheInfo(char *aname)
77 extern ino_t cacheInode;
78 extern struct osi_dev cacheDev;
79 extern afs_int32 afs_fsfragsize;
80 extern struct super_block *afs_cacheSBp;
82 code = osi_lookupname(aname, AFS_UIOSYS, 1, NULL, &dp);
83 if (code) return ENOENT;
85 cacheInode = dp->d_inode->i_ino;
86 cacheDev.dev = dp->d_inode->i_dev;
87 afs_fsfragsize = dp->d_inode->i_sb->s_blocksize;
88 afs_cacheSBp = dp->d_inode->i_sb;
96 #define FOP_READ(F, B, C) (F)->f_op->read(F, B, (size_t)(C), &(F)->f_pos)
97 #define FOP_WRITE(F, B, C) (F)->f_op->write(F, B, (size_t)(C), &(F)->f_pos)
100 * Seek, then read or write to an open inode. addrp points to data in
103 int osi_rdwr(int rw, struct osi_file *file, caddr_t addrp, size_t asize,
108 struct file *filp = &file->file;
109 off_t offset = file->offset;
111 /* Seek to the desired position. Return -1 on error. */
112 if (filp->f_op->llseek) {
113 if (filp->f_op->llseek(filp, (loff_t)offset, 0) != offset)
117 filp->f_pos = offset;
119 /* Read/Write the data. */
122 code = FOP_READ(filp, addrp, asize);
123 else if (rw == UIO_WRITE)
124 code = FOP_WRITE(filp, addrp, asize);
125 else /* all is well? */
130 *resid = asize - code;
137 /* This variant is called from AFS read/write routines and takes a uio
138 * struct and, if successful, returns 0.
140 int osi_file_uio_rdwr(struct osi_file *osifile, uio_t *uiop, int rw)
142 struct file *filp = &osifile->file;
143 struct inode *ip = FILE_INODE(&osifile->file);
149 if (uiop->uio_seg == AFS_UIOSYS)
152 filp->f_pos = uiop->uio_offset;
153 while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
155 count = iov->iov_len;
163 code = FOP_READ(filp, iov->iov_base, count);
165 code = FOP_WRITE(filp, iov->iov_base, count);
172 iov->iov_base += code;
173 iov->iov_len -= code;
174 uiop->uio_resid -= code;
175 uiop->uio_offset += code;
179 if (uiop->uio_seg == AFS_UIOSYS)
186 * Setup a uio struct.
188 void setup_uio(uio_t *uiop, struct iovec *iovecp, char *buf,
189 int pos, int count, uio_flag_t flag,
192 iovecp->iov_base = buf;
193 iovecp->iov_len = count;
194 uiop->uio_iov = iovecp;
195 uiop->uio_iovcnt = 1;
196 uiop->uio_offset = pos;
198 uiop->uio_resid = count;
199 uiop->uio_flag = flag;
204 * UIO_READ : dp -> uio
205 * UIO_WRITE : uio -> dp
207 int uiomove(char *dp, int length, uio_flag_t rw, uio_t *uiop)
213 while (length > 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
215 count = iov->iov_len;
226 switch(uiop->uio_seg) {
230 memcpy(iov->iov_base, dp, count); break;
232 memcpy(dp, iov->iov_base, count); break;
234 printf("uiomove: Bad rw = %d\n", rw);
241 AFS_COPYOUT(dp, iov->iov_base, count, code); break;
243 AFS_COPYIN(iov->iov_base, dp, count, code); break;
245 printf("uiomove: Bad rw = %d\n", rw);
250 printf("uiomove: Bad seg = %d\n", uiop->uio_seg);
256 iov->iov_base += count;
257 iov->iov_len -= count;
258 uiop->uio_offset += count;
259 uiop->uio_resid -= count;
264 void afs_osi_SetTime(osi_timeval_t *tvp)
266 extern int (*sys_settimeofdayp)(struct timeval *tv, struct timezone *tz);
267 #ifdef AFS_LINUX_64BIT_KERNEL
269 AFS_STATCNT(osi_SetTime);
270 tv.tv_sec = tvp->tv_sec;
271 tv.tv_usec = tvp->tv_usec;
272 (void) (*sys_settimeofdayp)(&tv, NULL);
276 AFS_STATCNT(osi_SetTime);
279 (void) (*sys_settimeofdayp)(tvp, NULL);
284 /* Free all the pages on any of the vnodes in the vlru. Must be done before
285 * freeing all memory.
287 void osi_linux_free_inode_pages(void)
292 extern struct vcache *afs_vhashT[VCSIZE];
294 for (i=0; i<VCSIZE; i++) {
295 for(tvc = afs_vhashT[i]; tvc; tvc=tvc->hnext) {
296 ip = (struct inode*)tvc;
297 #if defined(AFS_LINUX24_ENV)
298 if (ip->i_data.nrpages) {
302 invalidate_inode_pages(ip);
303 #if defined(AFS_LINUX24_ENV)
304 if (ip->i_data.nrpages) {
308 printf("Failed to invalidate all pages on inode 0x%x\n",
316 /* iput an inode. Since we still have a separate inode pool, we don't want
317 * to call iput on AFS inodes, since they would then end up on Linux's
320 void osi_iput(struct inode *ip)
322 extern void afs_delete_inode(struct inode *ip);
323 extern struct vfs *afs_globalVFS;
326 #if defined(AFS_LINUX24_ENV)
327 if (atomic_read(&ip->i_count) == 0 || atomic_read(&ip->i_count) & 0xffff0000) {
329 if (ip->i_count == 0 || ip->i_count & 0xffff0000) {
331 osi_Panic("IPUT Bad refCount %d on inode 0x%x\n",
332 #if defined(AFS_LINUX24_ENV)
333 atomic_read(&ip->i_count), ip);
338 if (afs_globalVFS && afs_globalVFS == ip->i_sb ) {
339 #if defined(AFS_LINUX24_ENV)
340 atomic_dec(&ip->i_count);
341 if (!atomic_read(&ip->i_count))
346 afs_delete_inode(ip);
353 /* check_bad_parent() : Checks if this dentry's vcache is a root vcache
354 * that has its mvid (parent dir's fid) pointer set to the wrong directory
355 * due to being mounted in multiple points at once. If so, check_bad_parent()
356 * calls afs_lookup() to correct the vcache's mvid, as well as the volume's
357 * dotdotfid and mtpoint fid members.
359 * dp - dentry to be checked.
363 * This dentry's vcache's mvid will be set to the correct parent directory's
365 * This root vnode's volume will have its dotdotfid and mtpoint fids set
366 * to the correct parent and mountpoint fids.
369 void check_bad_parent(struct dentry *dp)
372 struct vcache *vcp = (struct vcache*)dp->d_inode, *avc = NULL;
373 struct vcache *pvc = (struct vcache *)dp->d_parent->d_inode;
375 if (vcp->mvid->Fid.Volume != pvc->fid.Fid.Volume) { /* bad parent */
379 /* force a lookup, so vcp->mvid is fixed up */
380 afs_lookup(pvc, dp->d_name.name, &avc, credp);
381 if (!avc || vcp != avc) { /* bad, very bad.. */
382 afs_Trace4(afs_iclSetp, CM_TRACE_TMP_1S3L, ICL_TYPE_STRING,
383 "afs_linux_revalidate : bad pointer returned from afs_lookup origvc newvc dentry",
384 ICL_TYPE_POINTER, vcp,
385 ICL_TYPE_POINTER, avc,
386 ICL_TYPE_POINTER, dp);
389 } /* if bad parent */