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 # if defined(HAVE_LINUX_KTIME_GET_COARSE_REAL_TS64)
27 # define AFS_CURRENT_TIME(x) (ktime_get_coarse_real_ts64((x)))
29 # ifdef IATTR_TAKES_64BIT_TIME
30 # define AFS_CURRENT_TIME(x) do {*(x) = current_kernel_time64();} while (0)
32 # define AFS_CURRENT_TIME(x) do {*(x) = current_kernel_time();} while (0)
36 # define AFS_CURRENT_TIME(x) do {*(x) = CURRENT_TIME;} while(0)
39 int cache_fh_type = -1;
40 int cache_fh_len = -1;
42 extern struct osi_dev cacheDev;
43 extern struct vfsmount *afs_cacheMnt;
44 extern struct super_block *afs_cacheSBp;
45 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
46 extern struct cred *cache_creds;
49 /* Old export ops: decode_fh will call back here. Accept any dentry it suggests */
51 afs_fh_acceptable(void *context, struct dentry *dp)
57 afs_linux_raw_open(afs_dcache_id_t *ainode)
59 struct inode *tip = NULL;
60 struct dentry *dp = NULL;
62 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
63 const struct cred *cur_cred;
66 dp = afs_get_dentry_from_fh(afs_cacheSBp, ainode, cache_fh_len, cache_fh_type,
68 if ((!dp) || IS_ERR(dp)) {
69 afs_warn("afs: Cannot get dentry for cache file (code %d). Trying to continue, "
70 "but AFS accesses may return errors or panic the system\n",
75 tip->i_flags |= S_NOATIME; /* Disable updating access times. */
77 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
78 cur_cred = override_creds(cache_creds);
80 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
81 /* Use stashed credentials - prevent selinux/apparmor problems */
82 filp = afs_dentry_open(dp, afs_cacheMnt, O_RDWR, cache_creds);
84 filp = afs_dentry_open(dp, afs_cacheMnt, O_RDWR, current_cred());
86 filp = dentry_open(dget(dp), mntget(afs_cacheMnt), O_RDWR);
88 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
89 revert_creds(cur_cred);
92 afs_warn("afs: Cannot open cache file (code %d). Trying to continue, "
93 "but AFS accesses may return errors or panic the system\n",
104 osi_UFSOpen(afs_dcache_id_t *ainode)
106 struct osi_file *afile = NULL;
107 extern int cacheDiskType;
109 AFS_STATCNT(osi_UFSOpen);
110 if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
111 osi_Panic("UFSOpen called for non-UFS cache\n");
113 if (!afs_osicred_initialized) {
114 memset(&afs_osi_cred, 0, sizeof(afs_ucred_t));
115 crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */
116 afs_osicred_initialized = 1;
119 afile = kmalloc(sizeof(struct osi_file), GFP_NOFS);
121 afs_warn("afs: Failed to allocate memory for opening a cache file. "
122 "Trying to continue, but AFS access may return errors or panic "
127 memset(afile, 0, sizeof(struct osi_file));
129 afile->filp = afs_linux_raw_open(ainode);
131 afile->size = i_size_read(FILE_INODE(afile->filp));
136 osi_FreeLargeSpace(afile);
141 afile->proc = (int (*)())0;
142 return (void *)afile;
146 * Given a dentry, return the file handle as encoded by the filesystem.
147 * We can't assume anything about the length (words, not bytes).
148 * The cache has to live on a single filesystem with uniform file
149 * handles, otherwise we panic.
151 void osi_get_fh(struct dentry *dp, afs_ufs_dcache_id_t *ainode) {
155 if (cache_fh_len > 0)
156 max_len = cache_fh_len;
158 max_len = MAX_FH_LEN;
159 type = afs_get_fh_from_dentry(dp, ainode, &max_len);
161 osi_Panic("File handle encoding failed\n");
163 if (cache_fh_type < 0)
164 cache_fh_type = type;
165 if (cache_fh_len < 0) {
166 cache_fh_len = max_len;
168 if (type != cache_fh_type || max_len != cache_fh_len) {
169 osi_Panic("Inconsistent file handles within cache\n");
174 afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat)
176 AFS_STATCNT(osi_Stat);
177 astat->size = i_size_read(OSIFILE_INODE(afile));
178 astat->mtime = OSIFILE_INODE(afile)->i_mtime.tv_sec;
179 astat->atime = OSIFILE_INODE(afile)->i_atime.tv_sec;
185 osi_UFSClose(struct osi_file *afile)
187 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
188 const struct cred *cur_cred;
191 AFS_STATCNT(osi_Close);
193 if (OSIFILE_INODE(afile)) {
194 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
195 cur_cred = override_creds(cache_creds);
197 filp_close(afile->filp, NULL);
198 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
199 revert_creds(cur_cred);
208 osi_UFSTruncate(struct osi_file *afile, afs_int32 asize)
211 struct osi_stat tstat;
212 struct iattr newattrs;
213 struct inode *inode = OSIFILE_INODE(afile);
214 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
215 const struct cred *cur_cred;
217 AFS_STATCNT(osi_Truncate);
219 /* This routine only shrinks files, and most systems
220 * have very slow truncates, even when the file is already
221 * small enough. Check now and save some time.
223 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
224 cur_cred = override_creds(cache_creds);
226 code = afs_osi_Stat(afile, &tstat);
227 if (code || tstat.size <= asize)
230 afs_linux_lock_inode(inode);
231 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
232 down_write(&inode->i_alloc_sem);
234 newattrs.ia_size = asize;
235 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
236 AFS_CURRENT_TIME(&newattrs.ia_ctime);
238 /* avoid notify_change() since it wants to update dentry->d_parent */
239 code = afs_setattr_prepare(file_dentry(afile->filp), &newattrs);
241 code = afs_inode_setattr(afile, &newattrs);
243 truncate_inode_pages(&inode->i_data, asize);
245 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
246 up_write(&inode->i_alloc_sem);
248 afs_linux_unlock_inode(inode);
251 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
252 revert_creds(cur_cred);
258 /* Generic read interface */
260 afs_osi_Read(struct osi_file *afile, int offset, void *aptr,
267 memset(&auio, 0, sizeof(auio));
268 memset(&iov, 0, sizeof(iov));
270 AFS_STATCNT(osi_Read);
273 * If the osi_file passed in is NULL, panic only if AFS is not shutting
274 * down. No point in crashing when we are already shutting down
277 if (afs_shuttingdown == AFS_RUNNING)
278 osi_Panic("osi_Read called with null param");
284 afile->offset = offset;
285 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_READ, AFS_UIOSYS);
287 code = osi_rdwr(afile, &auio, UIO_READ);
290 code = asize - auio.uio_resid;
291 afile->offset += code;
293 afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, auio.uio_resid,
294 ICL_TYPE_INT32, code);
302 /* Generic write interface */
304 afs_osi_Write(struct osi_file *afile, afs_int32 offset, void *aptr,
311 memset(&auio, 0, sizeof(auio));
312 memset(&iov, 0, sizeof(iov));
314 AFS_STATCNT(osi_Write);
317 if (afs_shuttingdown == AFS_RUNNING)
318 osi_Panic("afs_osi_Write called with null param");
324 afile->offset = offset;
325 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_WRITE, AFS_UIOSYS);
327 code = osi_rdwr(afile, &auio, UIO_WRITE);
330 code = asize - auio.uio_resid;
331 afile->offset += code;
341 (*afile->proc)(afile, code);
347 /* This work should be handled by physstrat in ca/machdep.c.
348 This routine written from the RT NFS port strategy routine.
349 It has been generalized a bit, but should still be pretty clear. */
351 afs_osi_MapStrategy(int (*aproc) (struct buf * bp), struct buf *bp)
353 afs_int32 returnCode;
355 AFS_STATCNT(osi_MapStrategy);
356 returnCode = (*aproc) (bp);
362 shutdown_osifile(void)
364 AFS_STATCNT(shutdown_osifile);
365 if (afs_cold_shutdown) {
366 afs_osicred_initialized = 0;
370 /* Intialize cache device info and fragment size for disk cache partition. */
372 osi_InitCacheInfo(char *aname)
375 extern afs_dcache_id_t cacheInode;
377 extern struct osi_dev cacheDev;
378 extern afs_int32 afs_fsfragsize;
379 extern struct super_block *afs_cacheSBp;
380 extern struct vfsmount *afs_cacheMnt;
381 code = osi_lookupname_internal(aname, 1, &afs_cacheMnt, &dp);
385 osi_get_fh(dp, &cacheInode.ufs);
386 cacheDev.dev = dp->d_inode->i_sb->s_dev;
387 afs_fsfragsize = dp->d_inode->i_sb->s_blocksize - 1;
388 afs_cacheSBp = dp->d_inode->i_sb;
392 afs_init_sb_export_ops(afs_cacheSBp);
399 * seek, then read or write to an open inode. addrp points to data in
403 osi_rdwr(struct osi_file *osifile, struct uio *uiop, int rw)
405 struct file *filp = osifile->filp;
406 #ifdef AFS_FILE_NEEDS_SET_FS
407 mm_segment_t old_fs = {0};
408 #endif /* AFS_FILE_NEEDS_SET_FS */
412 unsigned long savelim;
414 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
415 const struct cred *cur_cred = override_creds(cache_creds);
418 savelim = current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur;
419 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
421 #ifdef AFS_FILE_NEEDS_SET_FS
422 if (uiop->uio_seg == AFS_UIOSYS) {
423 /* Switch into user space */
427 #endif /* AFS_FILE_NEEDS_SET_FS */
429 while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
431 count = iov->iov_len;
438 pos = uiop->uio_offset;
440 code = afs_file_read(filp, iov->iov_base, count, &pos);
442 code = afs_file_write(filp, iov->iov_base, count, &pos);
447 } else if (code == 0) {
449 * This is bad -- we can't read any more data from the
450 * file, but we have no good way of signaling a partial
457 iov->iov_base += code;
458 iov->iov_len -= code;
459 uiop->uio_resid -= code;
460 uiop->uio_offset += code;
464 #ifdef AFS_FILE_NEEDS_SET_FS
465 if (uiop->uio_seg == AFS_UIOSYS) {
466 /* Switch back into kernel space */
469 #endif /* AFS_FILE_NEEDS_SET_FS */
471 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = savelim;
472 #if defined(HAVE_LINUX_OVERRIDE_CREDS)
473 revert_creds(cur_cred);
480 * Setup a uio struct.
483 setup_uio(struct uio *uiop, struct iovec *iovecp, const char *buf, afs_offs_t pos,
484 int count, uio_flag_t flag, uio_seg_t seg)
486 iovecp->iov_base = (char *)buf;
487 iovecp->iov_len = count;
488 uiop->uio_iov = iovecp;
489 uiop->uio_iovcnt = 1;
490 uiop->uio_offset = pos;
492 uiop->uio_resid = count;
493 uiop->uio_flag = flag;
498 * UIO_READ : dp -> uio
499 * UIO_WRITE : uio -> dp
502 uiomove(char *dp, int length, uio_flag_t rw, struct uio *uiop)
508 while (length > 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
510 count = iov->iov_len;
521 switch (uiop->uio_seg) {
525 memcpy(iov->iov_base, dp, count);
528 memcpy(dp, iov->iov_base, count);
531 printf("uiomove: Bad rw = %d\n", rw);
538 AFS_COPYOUT(dp, iov->iov_base, count, code);
541 AFS_COPYIN(iov->iov_base, dp, count, code);
544 printf("uiomove: Bad rw = %d\n", rw);
549 printf("uiomove: Bad seg = %d\n", uiop->uio_seg);
555 iov->iov_base += count;
556 iov->iov_len -= count;
557 uiop->uio_offset += count;
558 uiop->uio_resid -= count;