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 <afsconfig.h>
15 #include "afs/param.h"
20 #include "afs/sysincludes.h"
21 #include "afsincludes.h"
22 #include "afs/afs_stats.h"
23 #if defined(AFS_LINUX24_ENV)
24 #include "h/smp_lock.h"
27 #if defined(AFS_LINUX24_ENV)
28 /* Lookup name and return vnode for same. */
30 osi_lookupname(char *aname, uio_seg_t seg, int followlink,
31 vnode_t ** dirvpp, struct dentry **dpp)
34 extern struct nameidata afs_cacheNd;
35 struct nameidata *nd = &afs_cacheNd;
38 if (seg == AFS_UIOUSER) {
40 followlink ? user_path_walk(aname,
41 nd) : user_path_walk_link(aname, nd);
43 if (path_init(aname, followlink ? LOOKUP_FOLLOW : 0, nd))
44 code = path_walk(aname, nd);
48 if (nd->dentry->d_inode) {
49 *dpp = dget(nd->dentry);
60 osi_lookupname(char *aname, uio_seg_t seg, int followlink, vnode_t ** dirvpp,
63 struct dentry *dp = NULL;
67 if (seg == AFS_UIOUSER) {
68 dp = followlink ? namei(aname) : lnamei(aname);
70 dp = lookup_dentry(aname, NULL, followlink ? 1 : 0);
73 if (dp && !IS_ERR(dp)) {
85 /* Intialize cache device info and fragment size for disk cache partition. */
87 osi_InitCacheInfo(char *aname)
91 extern ino_t cacheInode;
92 extern struct osi_dev cacheDev;
93 extern afs_int32 afs_fsfragsize;
94 extern struct super_block *afs_cacheSBp;
95 code = osi_lookupname(aname, AFS_UIOSYS, 1, NULL, &dp);
99 cacheInode = dp->d_inode->i_ino;
100 cacheDev.dev = dp->d_inode->i_sb->s_dev;
101 afs_fsfragsize = dp->d_inode->i_sb->s_blocksize - 1;
102 afs_cacheSBp = dp->d_inode->i_sb;
110 #define FOP_READ(F, B, C) (F)->f_op->read(F, B, (size_t)(C), &(F)->f_pos)
111 #define FOP_WRITE(F, B, C) (F)->f_op->write(F, B, (size_t)(C), &(F)->f_pos)
114 * Seek, then read or write to an open inode. addrp points to data in
118 osi_rdwr(int rw, struct osi_file *file, caddr_t addrp, size_t asize,
123 struct file *filp = &file->file;
124 off_t offset = file->offset;
125 unsigned long savelim;
127 /* Seek to the desired position. Return -1 on error. */
128 if (filp->f_op->llseek) {
129 if (filp->f_op->llseek(filp, (loff_t) offset, 0) != offset)
132 filp->f_pos = offset;
134 savelim = current->rlim[RLIMIT_FSIZE].rlim_cur;
135 current->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
137 /* Read/Write the data. */
140 code = FOP_READ(filp, addrp, asize);
141 else if (rw == UIO_WRITE)
142 code = FOP_WRITE(filp, addrp, asize);
143 else /* all is well? */
147 current->rlim[RLIMIT_FSIZE].rlim_cur = savelim;
150 *resid = asize - code;
156 /* This variant is called from AFS read/write routines and takes a uio
157 * struct and, if successful, returns 0.
160 osi_file_uio_rdwr(struct osi_file *osifile, uio_t * uiop, int rw)
162 struct file *filp = &osifile->file;
163 struct inode *ip = FILE_INODE(&osifile->file);
168 unsigned long savelim;
170 savelim = current->rlim[RLIMIT_FSIZE].rlim_cur;
171 current->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
173 if (uiop->uio_seg == AFS_UIOSYS)
176 filp->f_pos = uiop->uio_offset;
177 while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
179 count = iov->iov_len;
187 code = FOP_READ(filp, iov->iov_base, count);
189 code = FOP_WRITE(filp, iov->iov_base, count);
196 iov->iov_base += code;
197 iov->iov_len -= code;
198 uiop->uio_resid -= code;
199 uiop->uio_offset += code;
203 if (uiop->uio_seg == AFS_UIOSYS)
206 current->rlim[RLIMIT_FSIZE].rlim_cur = savelim;
212 * Setup a uio struct.
215 setup_uio(uio_t * uiop, struct iovec *iovecp, char *buf, afs_offs_t pos,
216 int count, uio_flag_t flag, uio_seg_t seg)
218 iovecp->iov_base = buf;
219 iovecp->iov_len = count;
220 uiop->uio_iov = iovecp;
221 uiop->uio_iovcnt = 1;
222 uiop->uio_offset = pos;
224 uiop->uio_resid = count;
225 uiop->uio_flag = flag;
230 * UIO_READ : dp -> uio
231 * UIO_WRITE : uio -> dp
234 uiomove(char *dp, int length, uio_flag_t rw, uio_t * uiop)
240 while (length > 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
242 count = iov->iov_len;
253 switch (uiop->uio_seg) {
257 memcpy(iov->iov_base, dp, count);
260 memcpy(dp, iov->iov_base, count);
263 printf("uiomove: Bad rw = %d\n", rw);
270 AFS_COPYOUT(dp, iov->iov_base, count, code);
273 AFS_COPYIN(iov->iov_base, dp, count, code);
276 printf("uiomove: Bad rw = %d\n", rw);
281 printf("uiomove: Bad seg = %d\n", uiop->uio_seg);
287 iov->iov_base += count;
288 iov->iov_len -= count;
289 uiop->uio_offset += count;
290 uiop->uio_resid -= count;
296 afs_osi_SetTime(osi_timeval_t * tvp)
298 extern int (*sys_settimeofdayp) (struct timeval * tv,
299 struct timezone * tz);
300 #ifdef AFS_LINUX_64BIT_KERNEL
302 AFS_STATCNT(osi_SetTime);
303 tv.tv_sec = tvp->tv_sec;
304 tv.tv_usec = tvp->tv_usec;
305 (void)(*sys_settimeofdayp) (&tv, NULL);
309 AFS_STATCNT(osi_SetTime);
312 (void)(*sys_settimeofdayp) (tvp, NULL);
317 /* Free all the pages on any of the vnodes in the vlru. Must be done before
318 * freeing all memory.
321 osi_linux_free_inode_pages(void)
326 extern struct vcache *afs_vhashT[VCSIZE];
328 for (i = 0; i < VCSIZE; i++) {
329 for (tvc = afs_vhashT[i]; tvc; tvc = tvc->hnext) {
331 #if defined(AFS_LINUX24_ENV)
332 if (ip->i_data.nrpages) {
336 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
337 truncate_inode_pages(&ip->i_data, 0);
338 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,15)
339 truncate_inode_pages(ip, 0);
341 invalidate_inode_pages(ip);
343 #if defined(AFS_LINUX24_ENV)
344 if (ip->i_data.nrpages) {
348 printf("Failed to invalidate all pages on inode 0x%x\n",
357 osi_clear_inode(struct inode *ip)
359 cred_t *credp = crref();
360 struct vcache *vcp = ITOAFS(ip);
362 #if defined(AFS_LINUX24_ENV)
363 if (atomic_read(&ip->i_count) > 1)
367 printf("afs_put_inode: ino %d (0x%x) has count %d\n", ip->i_ino, ip,
370 afs_InactiveVCache(vcp, credp);
371 ObtainWriteLock(&vcp->lock, 504);
372 #if defined(AFS_LINUX24_ENV)
373 atomic_set(&ip->i_count, 0);
377 ip->i_nlink = 0; /* iput checks this after calling this routine. */
378 ReleaseWriteLock(&vcp->lock);
382 /* iput an inode. Since we still have a separate inode pool, we don't want
383 * to call iput on AFS inodes, since they would then end up on Linux's
387 osi_iput(struct inode *ip)
389 extern struct vfs *afs_globalVFS;
392 #if defined(AFS_LINUX24_ENV)
393 if (atomic_read(&ip->i_count) == 0
394 || atomic_read(&ip->i_count) & 0xffff0000) {
396 if (ip->i_count == 0 || ip->i_count & 0xffff0000) {
398 osi_Panic("IPUT Bad refCount %d on inode 0x%x\n",
399 #if defined(AFS_LINUX24_ENV)
400 atomic_read(&ip->i_count), ip);
405 if (afs_globalVFS && afs_globalVFS == ip->i_sb) {
406 #if defined(AFS_LINUX24_ENV)
407 atomic_dec(&ip->i_count);
408 if (!atomic_read(&ip->i_count))
419 /* check_bad_parent() : Checks if this dentry's vcache is a root vcache
420 * that has its mvid (parent dir's fid) pointer set to the wrong directory
421 * due to being mounted in multiple points at once. If so, check_bad_parent()
422 * calls afs_lookup() to correct the vcache's mvid, as well as the volume's
423 * dotdotfid and mtpoint fid members.
425 * dp - dentry to be checked.
429 * This dentry's vcache's mvid will be set to the correct parent directory's
431 * This root vnode's volume will have its dotdotfid and mtpoint fids set
432 * to the correct parent and mountpoint fids.
436 check_bad_parent(struct dentry *dp)
439 struct vcache *vcp = ITOAFS(dp->d_inode), *avc = NULL;
440 struct vcache *pvc = ITOAFS(dp->d_parent->d_inode);
442 if (vcp->mvid->Fid.Volume != pvc->fid.Fid.Volume) { /* bad parent */
446 /* force a lookup, so vcp->mvid is fixed up */
447 afs_lookup(pvc, dp->d_name.name, &avc, credp);
448 if (!avc || vcp != avc) { /* bad, very bad.. */
449 afs_Trace4(afs_iclSetp, CM_TRACE_TMP_1S3L, ICL_TYPE_STRING,
450 "afs_linux_revalidate : bad pointer returned from afs_lookup origvc newvc dentry",
451 ICL_TYPE_POINTER, vcp, ICL_TYPE_POINTER, avc,
452 ICL_TYPE_POINTER, dp);
462 struct task_struct *rxk_ListenerTask;
468 sigfillset(¤t->blocked);
469 RECALC_SIGPENDING(current);
474 osi_linux_rxkreg(void)
476 rxk_ListenerTask = current;