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 osi_Panic("Can't open file: %d\n", (int) PTR_ERR(filp));
78 osi_UFSOpen(afs_dcache_id_t *ainode)
80 struct osi_file *afile = NULL;
81 extern int cacheDiskType;
83 AFS_STATCNT(osi_UFSOpen);
84 if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
85 osi_Panic("UFSOpen called for non-UFS cache\n");
87 if (!afs_osicred_initialized) {
88 /* valid for alpha_osf, SunOS, Ultrix */
89 memset(&afs_osi_cred, 0, sizeof(afs_ucred_t));
90 crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */
91 afs_osicred_initialized = 1;
94 afile = kmalloc(sizeof(struct osi_file), GFP_NOFS);
96 osi_Panic("osi_UFSOpen: Failed to allocate %d bytes for osi_file.\n",
97 (int)sizeof(struct osi_file));
99 memset(afile, 0, sizeof(struct osi_file));
101 afile->filp = afs_linux_raw_open(ainode);
102 afile->size = i_size_read(FILE_INODE(afile->filp));
105 afile->proc = (int (*)())0;
106 return (void *)afile;
110 * Given a dentry, return the file handle as encoded by the filesystem.
111 * We can't assume anything about the length (words, not bytes).
112 * The cache has to live on a single filesystem with uniform file
113 * handles, otherwise we panic.
115 void osi_get_fh(struct dentry *dp, afs_ufs_dcache_id_t *ainode) {
119 if (cache_fh_len > 0)
120 max_len = cache_fh_len;
122 max_len = MAX_FH_LEN;
123 type = afs_get_fh_from_dentry(dp, ainode, &max_len);
125 osi_Panic("File handle encoding failed\n");
127 if (cache_fh_type < 0)
128 cache_fh_type = type;
129 if (cache_fh_len < 0) {
130 cache_fh_len = max_len;
132 if (type != cache_fh_type || max_len != cache_fh_len) {
133 osi_Panic("Inconsistent file handles within cache\n");
138 afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat)
140 AFS_STATCNT(osi_Stat);
141 ObtainWriteLock(&afs_xosi, 320);
142 astat->size = i_size_read(OSIFILE_INODE(afile));
143 astat->mtime = OSIFILE_INODE(afile)->i_mtime.tv_sec;
144 astat->atime = OSIFILE_INODE(afile)->i_atime.tv_sec;
146 ReleaseWriteLock(&afs_xosi);
151 osi_UFSClose(struct osi_file *afile)
153 AFS_STATCNT(osi_Close);
155 if (OSIFILE_INODE(afile)) {
156 filp_close(afile->filp, NULL);
164 osi_UFSTruncate(struct osi_file *afile, afs_int32 asize)
167 struct osi_stat tstat;
168 struct iattr newattrs;
169 struct inode *inode = OSIFILE_INODE(afile);
170 AFS_STATCNT(osi_Truncate);
172 /* This routine only shrinks files, and most systems
173 * have very slow truncates, even when the file is already
174 * small enough. Check now and save some time.
176 code = afs_osi_Stat(afile, &tstat);
177 if (code || tstat.size <= asize)
179 ObtainWriteLock(&afs_xosi, 321);
181 afs_linux_lock_inode(inode);
182 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
183 down_write(&inode->i_alloc_sem);
185 newattrs.ia_size = asize;
186 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
187 newattrs.ia_ctime = CURRENT_TIME;
189 /* avoid notify_change() since it wants to update dentry->d_parent */
190 #ifdef HAVE_LINUX_SETATTR_PREPARE
191 code = setattr_prepare(file_dentry(afile->filp), &newattrs);
193 code = inode_change_ok(inode, &newattrs);
196 code = afs_inode_setattr(afile, &newattrs);
198 truncate_inode_pages(&inode->i_data, asize);
200 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
201 up_write(&inode->i_alloc_sem);
203 afs_linux_unlock_inode(inode);
205 ReleaseWriteLock(&afs_xosi);
210 /* Generic read interface */
212 afs_osi_Read(struct osi_file *afile, int offset, void *aptr,
219 memset(&auio, 0, sizeof(auio));
220 memset(&iov, 0, sizeof(iov));
222 AFS_STATCNT(osi_Read);
225 * If the osi_file passed in is NULL, panic only if AFS is not shutting
226 * down. No point in crashing when we are already shutting down
229 if (afs_shuttingdown == AFS_RUNNING)
230 osi_Panic("osi_Read called with null param");
236 afile->offset = offset;
237 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_READ, AFS_UIOSYS);
239 code = osi_rdwr(afile, &auio, UIO_READ);
242 code = asize - auio.uio_resid;
243 afile->offset += code;
245 afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, auio.uio_resid,
246 ICL_TYPE_INT32, code);
254 /* Generic write interface */
256 afs_osi_Write(struct osi_file *afile, afs_int32 offset, void *aptr,
263 memset(&auio, 0, sizeof(auio));
264 memset(&iov, 0, sizeof(iov));
266 AFS_STATCNT(osi_Write);
269 if (afs_shuttingdown == AFS_RUNNING)
270 osi_Panic("afs_osi_Write called with null param");
276 afile->offset = offset;
277 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_WRITE, AFS_UIOSYS);
279 code = osi_rdwr(afile, &auio, UIO_WRITE);
282 code = asize - auio.uio_resid;
283 afile->offset += code;
287 ("\n\n\n*** Cache partition is FULL - Decrease cachesize!!! ***\n\n");
294 (*afile->proc)(afile, code);
300 /* This work should be handled by physstrat in ca/machdep.c.
301 This routine written from the RT NFS port strategy routine.
302 It has been generalized a bit, but should still be pretty clear. */
304 afs_osi_MapStrategy(int (*aproc) (struct buf * bp), struct buf *bp)
306 afs_int32 returnCode;
308 AFS_STATCNT(osi_MapStrategy);
309 returnCode = (*aproc) (bp);
315 shutdown_osifile(void)
317 AFS_STATCNT(shutdown_osifile);
318 if (afs_cold_shutdown) {
319 afs_osicred_initialized = 0;
323 /* Intialize cache device info and fragment size for disk cache partition. */
325 osi_InitCacheInfo(char *aname)
328 extern afs_dcache_id_t cacheInode;
330 extern struct osi_dev cacheDev;
331 extern afs_int32 afs_fsfragsize;
332 extern struct super_block *afs_cacheSBp;
333 extern struct vfsmount *afs_cacheMnt;
334 code = osi_lookupname_internal(aname, 1, &afs_cacheMnt, &dp);
338 osi_get_fh(dp, &cacheInode.ufs);
339 cacheDev.dev = dp->d_inode->i_sb->s_dev;
340 afs_fsfragsize = dp->d_inode->i_sb->s_blocksize - 1;
341 afs_cacheSBp = dp->d_inode->i_sb;
345 afs_init_sb_export_ops(afs_cacheSBp);
352 * seek, then read or write to an open inode. addrp points to data in
356 osi_rdwr(struct osi_file *osifile, struct uio *uiop, int rw)
358 struct file *filp = osifile->filp;
359 #ifdef AFS_FILE_NEEDS_SET_FS
360 mm_segment_t old_fs = {0};
361 #endif /* AFS_FILE_NEEDS_SET_FS */
365 unsigned long savelim;
368 savelim = current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur;
369 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
371 #ifdef AFS_FILE_NEEDS_SET_FS
372 if (uiop->uio_seg == AFS_UIOSYS) {
373 /* Switch into user space */
377 #endif /* AFS_FILE_NEEDS_SET_FS */
379 while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
381 count = iov->iov_len;
388 pos = uiop->uio_offset;
390 code = afs_file_read(filp, iov->iov_base, count, &pos);
392 code = afs_file_write(filp, iov->iov_base, count, &pos);
397 } else if (code == 0) {
399 * This is bad -- we can't read any more data from the
400 * file, but we have no good way of signaling a partial
407 iov->iov_base += code;
408 iov->iov_len -= code;
409 uiop->uio_resid -= code;
410 uiop->uio_offset += code;
414 #ifdef AFS_FILE_NEEDS_SET_FS
415 if (uiop->uio_seg == AFS_UIOSYS) {
416 /* Switch back into kernel space */
419 #endif /* AFS_FILE_NEEDS_SET_FS */
421 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = savelim;
427 * Setup a uio struct.
430 setup_uio(struct uio *uiop, struct iovec *iovecp, const char *buf, afs_offs_t pos,
431 int count, uio_flag_t flag, uio_seg_t seg)
433 iovecp->iov_base = (char *)buf;
434 iovecp->iov_len = count;
435 uiop->uio_iov = iovecp;
436 uiop->uio_iovcnt = 1;
437 uiop->uio_offset = pos;
439 uiop->uio_resid = count;
440 uiop->uio_flag = flag;
445 * UIO_READ : dp -> uio
446 * UIO_WRITE : uio -> dp
449 uiomove(char *dp, int length, uio_flag_t rw, struct uio *uiop)
455 while (length > 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
457 count = iov->iov_len;
468 switch (uiop->uio_seg) {
472 memcpy(iov->iov_base, dp, count);
475 memcpy(dp, iov->iov_base, count);
478 printf("uiomove: Bad rw = %d\n", rw);
485 AFS_COPYOUT(dp, iov->iov_base, count, code);
488 AFS_COPYIN(iov->iov_base, dp, count, code);
491 printf("uiomove: Bad rw = %d\n", rw);
496 printf("uiomove: Bad seg = %d\n", uiop->uio_seg);
502 iov->iov_base += count;
503 iov->iov_len -= count;
504 uiop->uio_offset += count;
505 uiop->uio_resid -= count;