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
10 #include <afsconfig.h>
11 #include "afs/param.h"
14 #include <linux/module.h> /* early to avoid printf->printk mapping */
15 #include "afs/sysincludes.h" /* Standard vendor system headers */
16 #include "afsincludes.h" /* Afs-based standard headers */
17 #include "afs/afs_stats.h" /* afs statistics */
18 #include <linux/namei.h>
20 #if defined(HAVE_LINUX_EXPORTFS_H)
21 #include <linux/exportfs.h>
23 #include "osi_compat.h"
26 #define CURRENT_TIME (current_kernel_time())
29 int cache_fh_type = -1;
30 int cache_fh_len = -1;
32 afs_lock_t afs_xosi; /* lock is for tvattr */
33 extern struct osi_dev cacheDev;
34 extern struct vfsmount *afs_cacheMnt;
35 extern struct super_block *afs_cacheSBp;
36 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
37 extern struct cred *cache_creds;
40 /* Old export ops: decode_fh will call back here. Accept any dentry it suggests */
42 afs_fh_acceptable(void *context, struct dentry *dp)
48 afs_linux_raw_open(afs_dcache_id_t *ainode)
50 struct inode *tip = NULL;
51 struct dentry *dp = NULL;
54 dp = afs_get_dentry_from_fh(afs_cacheSBp, ainode, cache_fh_len, cache_fh_type,
56 if ((!dp) || IS_ERR(dp))
57 osi_Panic("Can't get dentry\n");
59 tip->i_flags |= S_NOATIME; /* Disable updating access times. */
61 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
62 /* Use stashed credentials - prevent selinux/apparmor problems */
63 filp = afs_dentry_open(dp, afs_cacheMnt, O_RDWR, cache_creds);
65 filp = afs_dentry_open(dp, afs_cacheMnt, O_RDWR, current_cred());
67 filp = dentry_open(dget(dp), mntget(afs_cacheMnt), O_RDWR);
70 afs_warn("afs: Cannot open cache file (code %d). Trying to continue, "
71 "but AFS accesses may return errors or panic the system\n",
82 osi_UFSOpen(afs_dcache_id_t *ainode)
84 struct osi_file *afile = NULL;
85 extern int cacheDiskType;
87 AFS_STATCNT(osi_UFSOpen);
88 if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
89 osi_Panic("UFSOpen called for non-UFS cache\n");
91 if (!afs_osicred_initialized) {
92 /* valid for alpha_osf, SunOS, Ultrix */
93 memset(&afs_osi_cred, 0, sizeof(afs_ucred_t));
94 crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */
95 afs_osicred_initialized = 1;
98 afile = kmalloc(sizeof(struct osi_file), GFP_NOFS);
100 osi_Panic("osi_UFSOpen: Failed to allocate %d bytes for osi_file.\n",
101 (int)sizeof(struct osi_file));
103 memset(afile, 0, sizeof(struct osi_file));
105 afile->filp = afs_linux_raw_open(ainode);
107 afile->size = i_size_read(FILE_INODE(afile->filp));
112 osi_FreeLargeSpace(afile);
117 afile->proc = (int (*)())0;
118 return (void *)afile;
122 * Given a dentry, return the file handle as encoded by the filesystem.
123 * We can't assume anything about the length (words, not bytes).
124 * The cache has to live on a single filesystem with uniform file
125 * handles, otherwise we panic.
127 void osi_get_fh(struct dentry *dp, afs_ufs_dcache_id_t *ainode) {
131 if (cache_fh_len > 0)
132 max_len = cache_fh_len;
134 max_len = MAX_FH_LEN;
135 type = afs_get_fh_from_dentry(dp, ainode, &max_len);
137 osi_Panic("File handle encoding failed\n");
139 if (cache_fh_type < 0)
140 cache_fh_type = type;
141 if (cache_fh_len < 0) {
142 cache_fh_len = max_len;
144 if (type != cache_fh_type || max_len != cache_fh_len) {
145 osi_Panic("Inconsistent file handles within cache\n");
150 afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat)
152 AFS_STATCNT(osi_Stat);
153 ObtainWriteLock(&afs_xosi, 320);
154 astat->size = i_size_read(OSIFILE_INODE(afile));
155 astat->mtime = OSIFILE_INODE(afile)->i_mtime.tv_sec;
156 astat->atime = OSIFILE_INODE(afile)->i_atime.tv_sec;
158 ReleaseWriteLock(&afs_xosi);
163 osi_UFSClose(struct osi_file *afile)
165 AFS_STATCNT(osi_Close);
167 if (OSIFILE_INODE(afile)) {
168 filp_close(afile->filp, NULL);
176 osi_UFSTruncate(struct osi_file *afile, afs_int32 asize)
179 struct osi_stat tstat;
180 struct iattr newattrs;
181 struct inode *inode = OSIFILE_INODE(afile);
182 AFS_STATCNT(osi_Truncate);
184 /* This routine only shrinks files, and most systems
185 * have very slow truncates, even when the file is already
186 * small enough. Check now and save some time.
188 code = afs_osi_Stat(afile, &tstat);
189 if (code || tstat.size <= asize)
191 ObtainWriteLock(&afs_xosi, 321);
193 afs_linux_lock_inode(inode);
194 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
195 down_write(&inode->i_alloc_sem);
197 newattrs.ia_size = asize;
198 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
199 newattrs.ia_ctime = CURRENT_TIME;
201 /* avoid notify_change() since it wants to update dentry->d_parent */
202 #ifdef HAVE_LINUX_SETATTR_PREPARE
203 code = setattr_prepare(file_dentry(afile->filp), &newattrs);
205 code = inode_change_ok(inode, &newattrs);
208 code = afs_inode_setattr(afile, &newattrs);
210 truncate_inode_pages(&inode->i_data, asize);
212 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
213 up_write(&inode->i_alloc_sem);
215 afs_linux_unlock_inode(inode);
217 ReleaseWriteLock(&afs_xosi);
222 /* Generic read interface */
224 afs_osi_Read(struct osi_file *afile, int offset, void *aptr,
231 memset(&auio, 0, sizeof(auio));
232 memset(&iov, 0, sizeof(iov));
234 AFS_STATCNT(osi_Read);
237 * If the osi_file passed in is NULL, panic only if AFS is not shutting
238 * down. No point in crashing when we are already shutting down
241 if (afs_shuttingdown == AFS_RUNNING)
242 osi_Panic("osi_Read called with null param");
248 afile->offset = offset;
249 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_READ, AFS_UIOSYS);
251 code = osi_rdwr(afile, &auio, UIO_READ);
254 code = asize - auio.uio_resid;
255 afile->offset += code;
257 afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, auio.uio_resid,
258 ICL_TYPE_INT32, code);
266 /* Generic write interface */
268 afs_osi_Write(struct osi_file *afile, afs_int32 offset, void *aptr,
275 memset(&auio, 0, sizeof(auio));
276 memset(&iov, 0, sizeof(iov));
278 AFS_STATCNT(osi_Write);
281 if (afs_shuttingdown == AFS_RUNNING)
282 osi_Panic("afs_osi_Write called with null param");
288 afile->offset = offset;
289 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_WRITE, AFS_UIOSYS);
291 code = osi_rdwr(afile, &auio, UIO_WRITE);
294 code = asize - auio.uio_resid;
295 afile->offset += code;
299 ("\n\n\n*** Cache partition is FULL - Decrease cachesize!!! ***\n\n");
306 (*afile->proc)(afile, code);
312 /* This work should be handled by physstrat in ca/machdep.c.
313 This routine written from the RT NFS port strategy routine.
314 It has been generalized a bit, but should still be pretty clear. */
316 afs_osi_MapStrategy(int (*aproc) (struct buf * bp), struct buf *bp)
318 afs_int32 returnCode;
320 AFS_STATCNT(osi_MapStrategy);
321 returnCode = (*aproc) (bp);
327 shutdown_osifile(void)
329 AFS_STATCNT(shutdown_osifile);
330 if (afs_cold_shutdown) {
331 afs_osicred_initialized = 0;
335 /* Intialize cache device info and fragment size for disk cache partition. */
337 osi_InitCacheInfo(char *aname)
340 extern afs_dcache_id_t cacheInode;
342 extern struct osi_dev cacheDev;
343 extern afs_int32 afs_fsfragsize;
344 extern struct super_block *afs_cacheSBp;
345 extern struct vfsmount *afs_cacheMnt;
346 code = osi_lookupname_internal(aname, 1, &afs_cacheMnt, &dp);
350 osi_get_fh(dp, &cacheInode.ufs);
351 cacheDev.dev = dp->d_inode->i_sb->s_dev;
352 afs_fsfragsize = dp->d_inode->i_sb->s_blocksize - 1;
353 afs_cacheSBp = dp->d_inode->i_sb;
357 afs_init_sb_export_ops(afs_cacheSBp);
364 * seek, then read or write to an open inode. addrp points to data in
368 osi_rdwr(struct osi_file *osifile, struct uio *uiop, int rw)
370 struct file *filp = osifile->filp;
371 #ifdef AFS_FILE_NEEDS_SET_FS
372 mm_segment_t old_fs = {0};
373 #endif /* AFS_FILE_NEEDS_SET_FS */
377 unsigned long savelim;
380 savelim = current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur;
381 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
383 #ifdef AFS_FILE_NEEDS_SET_FS
384 if (uiop->uio_seg == AFS_UIOSYS) {
385 /* Switch into user space */
389 #endif /* AFS_FILE_NEEDS_SET_FS */
391 while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
393 count = iov->iov_len;
400 pos = uiop->uio_offset;
402 code = afs_file_read(filp, iov->iov_base, count, &pos);
404 code = afs_file_write(filp, iov->iov_base, count, &pos);
409 } else if (code == 0) {
411 * This is bad -- we can't read any more data from the
412 * file, but we have no good way of signaling a partial
419 iov->iov_base += code;
420 iov->iov_len -= code;
421 uiop->uio_resid -= code;
422 uiop->uio_offset += code;
426 #ifdef AFS_FILE_NEEDS_SET_FS
427 if (uiop->uio_seg == AFS_UIOSYS) {
428 /* Switch back into kernel space */
431 #endif /* AFS_FILE_NEEDS_SET_FS */
433 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = savelim;
439 * Setup a uio struct.
442 setup_uio(struct uio *uiop, struct iovec *iovecp, const char *buf, afs_offs_t pos,
443 int count, uio_flag_t flag, uio_seg_t seg)
445 iovecp->iov_base = (char *)buf;
446 iovecp->iov_len = count;
447 uiop->uio_iov = iovecp;
448 uiop->uio_iovcnt = 1;
449 uiop->uio_offset = pos;
451 uiop->uio_resid = count;
452 uiop->uio_flag = flag;
457 * UIO_READ : dp -> uio
458 * UIO_WRITE : uio -> dp
461 uiomove(char *dp, int length, uio_flag_t rw, struct uio *uiop)
467 while (length > 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
469 count = iov->iov_len;
480 switch (uiop->uio_seg) {
484 memcpy(iov->iov_base, dp, count);
487 memcpy(dp, iov->iov_base, count);
490 printf("uiomove: Bad rw = %d\n", rw);
497 AFS_COPYOUT(dp, iov->iov_base, count, code);
500 AFS_COPYIN(iov->iov_base, dp, count, code);
503 printf("uiomove: Bad rw = %d\n", rw);
508 printf("uiomove: Bad seg = %d\n", uiop->uio_seg);
514 iov->iov_base += count;
515 iov->iov_len -= count;
516 uiop->uio_offset += count;
517 uiop->uio_resid -= count;