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 # ifdef IATTR_TAKES_64BIT_TIME
27 # define CURRENT_TIME (current_kernel_time64())
29 # define CURRENT_TIME (current_kernel_time())
33 int cache_fh_type = -1;
34 int cache_fh_len = -1;
36 afs_lock_t afs_xosi; /* lock is for tvattr */
37 extern struct osi_dev cacheDev;
38 extern struct vfsmount *afs_cacheMnt;
39 extern struct super_block *afs_cacheSBp;
40 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
41 extern struct cred *cache_creds;
44 /* Old export ops: decode_fh will call back here. Accept any dentry it suggests */
46 afs_fh_acceptable(void *context, struct dentry *dp)
52 afs_linux_raw_open(afs_dcache_id_t *ainode)
54 struct inode *tip = NULL;
55 struct dentry *dp = NULL;
58 dp = afs_get_dentry_from_fh(afs_cacheSBp, ainode, cache_fh_len, cache_fh_type,
60 if ((!dp) || IS_ERR(dp))
61 osi_Panic("Can't get dentry\n");
63 tip->i_flags |= S_NOATIME; /* Disable updating access times. */
65 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
66 /* Use stashed credentials - prevent selinux/apparmor problems */
67 filp = afs_dentry_open(dp, afs_cacheMnt, O_RDWR, cache_creds);
69 filp = afs_dentry_open(dp, afs_cacheMnt, O_RDWR, current_cred());
71 filp = dentry_open(dget(dp), mntget(afs_cacheMnt), O_RDWR);
74 afs_warn("afs: Cannot open cache file (code %d). Trying to continue, "
75 "but AFS accesses may return errors or panic the system\n",
86 osi_UFSOpen(afs_dcache_id_t *ainode)
88 struct osi_file *afile = NULL;
89 extern int cacheDiskType;
91 AFS_STATCNT(osi_UFSOpen);
92 if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
93 osi_Panic("UFSOpen called for non-UFS cache\n");
95 if (!afs_osicred_initialized) {
96 /* valid for SunOS, Ultrix */
97 memset(&afs_osi_cred, 0, sizeof(afs_ucred_t));
98 crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */
99 afs_osicred_initialized = 1;
102 afile = kmalloc(sizeof(struct osi_file), GFP_NOFS);
104 osi_Panic("osi_UFSOpen: Failed to allocate %d bytes for osi_file.\n",
105 (int)sizeof(struct osi_file));
107 memset(afile, 0, sizeof(struct osi_file));
109 afile->filp = afs_linux_raw_open(ainode);
111 afile->size = i_size_read(FILE_INODE(afile->filp));
116 osi_FreeLargeSpace(afile);
121 afile->proc = (int (*)())0;
122 return (void *)afile;
126 * Given a dentry, return the file handle as encoded by the filesystem.
127 * We can't assume anything about the length (words, not bytes).
128 * The cache has to live on a single filesystem with uniform file
129 * handles, otherwise we panic.
131 void osi_get_fh(struct dentry *dp, afs_ufs_dcache_id_t *ainode) {
135 if (cache_fh_len > 0)
136 max_len = cache_fh_len;
138 max_len = MAX_FH_LEN;
139 type = afs_get_fh_from_dentry(dp, ainode, &max_len);
141 osi_Panic("File handle encoding failed\n");
143 if (cache_fh_type < 0)
144 cache_fh_type = type;
145 if (cache_fh_len < 0) {
146 cache_fh_len = max_len;
148 if (type != cache_fh_type || max_len != cache_fh_len) {
149 osi_Panic("Inconsistent file handles within cache\n");
154 afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat)
156 AFS_STATCNT(osi_Stat);
157 ObtainWriteLock(&afs_xosi, 320);
158 astat->size = i_size_read(OSIFILE_INODE(afile));
159 astat->mtime = OSIFILE_INODE(afile)->i_mtime.tv_sec;
160 astat->atime = OSIFILE_INODE(afile)->i_atime.tv_sec;
162 ReleaseWriteLock(&afs_xosi);
167 osi_UFSClose(struct osi_file *afile)
169 AFS_STATCNT(osi_Close);
171 if (OSIFILE_INODE(afile)) {
172 filp_close(afile->filp, NULL);
180 osi_UFSTruncate(struct osi_file *afile, afs_int32 asize)
183 struct osi_stat tstat;
184 struct iattr newattrs;
185 struct inode *inode = OSIFILE_INODE(afile);
186 AFS_STATCNT(osi_Truncate);
188 /* This routine only shrinks files, and most systems
189 * have very slow truncates, even when the file is already
190 * small enough. Check now and save some time.
192 code = afs_osi_Stat(afile, &tstat);
193 if (code || tstat.size <= asize)
195 ObtainWriteLock(&afs_xosi, 321);
197 afs_linux_lock_inode(inode);
198 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
199 down_write(&inode->i_alloc_sem);
201 newattrs.ia_size = asize;
202 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
203 newattrs.ia_ctime = CURRENT_TIME;
205 /* avoid notify_change() since it wants to update dentry->d_parent */
206 #ifdef HAVE_LINUX_SETATTR_PREPARE
207 code = setattr_prepare(file_dentry(afile->filp), &newattrs);
209 code = inode_change_ok(inode, &newattrs);
212 code = afs_inode_setattr(afile, &newattrs);
214 truncate_inode_pages(&inode->i_data, asize);
216 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
217 up_write(&inode->i_alloc_sem);
219 afs_linux_unlock_inode(inode);
221 ReleaseWriteLock(&afs_xosi);
226 /* Generic read interface */
228 afs_osi_Read(struct osi_file *afile, int offset, void *aptr,
235 memset(&auio, 0, sizeof(auio));
236 memset(&iov, 0, sizeof(iov));
238 AFS_STATCNT(osi_Read);
241 * If the osi_file passed in is NULL, panic only if AFS is not shutting
242 * down. No point in crashing when we are already shutting down
245 if (afs_shuttingdown == AFS_RUNNING)
246 osi_Panic("osi_Read called with null param");
252 afile->offset = offset;
253 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_READ, AFS_UIOSYS);
255 code = osi_rdwr(afile, &auio, UIO_READ);
258 code = asize - auio.uio_resid;
259 afile->offset += code;
261 afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, auio.uio_resid,
262 ICL_TYPE_INT32, code);
270 /* Generic write interface */
272 afs_osi_Write(struct osi_file *afile, afs_int32 offset, void *aptr,
279 memset(&auio, 0, sizeof(auio));
280 memset(&iov, 0, sizeof(iov));
282 AFS_STATCNT(osi_Write);
285 if (afs_shuttingdown == AFS_RUNNING)
286 osi_Panic("afs_osi_Write called with null param");
292 afile->offset = offset;
293 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_WRITE, AFS_UIOSYS);
295 code = osi_rdwr(afile, &auio, UIO_WRITE);
298 code = asize - auio.uio_resid;
299 afile->offset += code;
303 ("\n\n\n*** Cache partition is FULL - Decrease cachesize!!! ***\n\n");
310 (*afile->proc)(afile, code);
316 /* This work should be handled by physstrat in ca/machdep.c.
317 This routine written from the RT NFS port strategy routine.
318 It has been generalized a bit, but should still be pretty clear. */
320 afs_osi_MapStrategy(int (*aproc) (struct buf * bp), struct buf *bp)
322 afs_int32 returnCode;
324 AFS_STATCNT(osi_MapStrategy);
325 returnCode = (*aproc) (bp);
331 shutdown_osifile(void)
333 AFS_STATCNT(shutdown_osifile);
334 if (afs_cold_shutdown) {
335 afs_osicred_initialized = 0;
339 /* Intialize cache device info and fragment size for disk cache partition. */
341 osi_InitCacheInfo(char *aname)
344 extern afs_dcache_id_t cacheInode;
346 extern struct osi_dev cacheDev;
347 extern afs_int32 afs_fsfragsize;
348 extern struct super_block *afs_cacheSBp;
349 extern struct vfsmount *afs_cacheMnt;
350 code = osi_lookupname_internal(aname, 1, &afs_cacheMnt, &dp);
354 osi_get_fh(dp, &cacheInode.ufs);
355 cacheDev.dev = dp->d_inode->i_sb->s_dev;
356 afs_fsfragsize = dp->d_inode->i_sb->s_blocksize - 1;
357 afs_cacheSBp = dp->d_inode->i_sb;
361 afs_init_sb_export_ops(afs_cacheSBp);
368 * seek, then read or write to an open inode. addrp points to data in
372 osi_rdwr(struct osi_file *osifile, struct uio *uiop, int rw)
374 struct file *filp = osifile->filp;
375 #ifdef AFS_FILE_NEEDS_SET_FS
376 mm_segment_t old_fs = {0};
377 #endif /* AFS_FILE_NEEDS_SET_FS */
381 unsigned long savelim;
384 savelim = current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur;
385 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
387 #ifdef AFS_FILE_NEEDS_SET_FS
388 if (uiop->uio_seg == AFS_UIOSYS) {
389 /* Switch into user space */
393 #endif /* AFS_FILE_NEEDS_SET_FS */
395 while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
397 count = iov->iov_len;
404 pos = uiop->uio_offset;
406 code = afs_file_read(filp, iov->iov_base, count, &pos);
408 code = afs_file_write(filp, iov->iov_base, count, &pos);
413 } else if (code == 0) {
415 * This is bad -- we can't read any more data from the
416 * file, but we have no good way of signaling a partial
423 iov->iov_base += code;
424 iov->iov_len -= code;
425 uiop->uio_resid -= code;
426 uiop->uio_offset += code;
430 #ifdef AFS_FILE_NEEDS_SET_FS
431 if (uiop->uio_seg == AFS_UIOSYS) {
432 /* Switch back into kernel space */
435 #endif /* AFS_FILE_NEEDS_SET_FS */
437 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = savelim;
443 * Setup a uio struct.
446 setup_uio(struct uio *uiop, struct iovec *iovecp, const char *buf, afs_offs_t pos,
447 int count, uio_flag_t flag, uio_seg_t seg)
449 iovecp->iov_base = (char *)buf;
450 iovecp->iov_len = count;
451 uiop->uio_iov = iovecp;
452 uiop->uio_iovcnt = 1;
453 uiop->uio_offset = pos;
455 uiop->uio_resid = count;
456 uiop->uio_flag = flag;
461 * UIO_READ : dp -> uio
462 * UIO_WRITE : uio -> dp
465 uiomove(char *dp, int length, uio_flag_t rw, struct uio *uiop)
471 while (length > 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
473 count = iov->iov_len;
484 switch (uiop->uio_seg) {
488 memcpy(iov->iov_base, dp, count);
491 memcpy(dp, iov->iov_base, count);
494 printf("uiomove: Bad rw = %d\n", rw);
501 AFS_COPYOUT(dp, iov->iov_base, count, code);
504 AFS_COPYIN(iov->iov_base, dp, count, code);
507 printf("uiomove: Bad rw = %d\n", rw);
512 printf("uiomove: Bad seg = %d\n", uiop->uio_seg);
518 iov->iov_base += count;
519 iov->iov_len -= count;
520 uiop->uio_offset += count;
521 uiop->uio_resid -= count;