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;
63 dp = afs_get_dentry_from_fh(afs_cacheSBp, ainode, cache_fh_len, cache_fh_type,
65 if ((!dp) || IS_ERR(dp))
66 osi_Panic("Can't get dentry\n");
68 tip->i_flags |= S_NOATIME; /* Disable updating access times. */
70 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
71 /* Use stashed credentials - prevent selinux/apparmor problems */
72 filp = afs_dentry_open(dp, afs_cacheMnt, O_RDWR, cache_creds);
74 filp = afs_dentry_open(dp, afs_cacheMnt, O_RDWR, current_cred());
76 filp = dentry_open(dget(dp), mntget(afs_cacheMnt), O_RDWR);
79 afs_warn("afs: Cannot open cache file (code %d). Trying to continue, "
80 "but AFS accesses may return errors or panic the system\n",
91 osi_UFSOpen(afs_dcache_id_t *ainode)
93 struct osi_file *afile = NULL;
94 extern int cacheDiskType;
96 AFS_STATCNT(osi_UFSOpen);
97 if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
98 osi_Panic("UFSOpen called for non-UFS cache\n");
100 if (!afs_osicred_initialized) {
101 memset(&afs_osi_cred, 0, sizeof(afs_ucred_t));
102 crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */
103 afs_osicred_initialized = 1;
106 afile = kmalloc(sizeof(struct osi_file), GFP_NOFS);
108 osi_Panic("osi_UFSOpen: Failed to allocate %d bytes for osi_file.\n",
109 (int)sizeof(struct osi_file));
111 memset(afile, 0, sizeof(struct osi_file));
113 afile->filp = afs_linux_raw_open(ainode);
115 afile->size = i_size_read(FILE_INODE(afile->filp));
120 osi_FreeLargeSpace(afile);
125 afile->proc = (int (*)())0;
126 return (void *)afile;
130 * Given a dentry, return the file handle as encoded by the filesystem.
131 * We can't assume anything about the length (words, not bytes).
132 * The cache has to live on a single filesystem with uniform file
133 * handles, otherwise we panic.
135 void osi_get_fh(struct dentry *dp, afs_ufs_dcache_id_t *ainode) {
139 if (cache_fh_len > 0)
140 max_len = cache_fh_len;
142 max_len = MAX_FH_LEN;
143 type = afs_get_fh_from_dentry(dp, ainode, &max_len);
145 osi_Panic("File handle encoding failed\n");
147 if (cache_fh_type < 0)
148 cache_fh_type = type;
149 if (cache_fh_len < 0) {
150 cache_fh_len = max_len;
152 if (type != cache_fh_type || max_len != cache_fh_len) {
153 osi_Panic("Inconsistent file handles within cache\n");
158 afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat)
160 AFS_STATCNT(osi_Stat);
161 astat->size = i_size_read(OSIFILE_INODE(afile));
162 astat->mtime = OSIFILE_INODE(afile)->i_mtime.tv_sec;
163 astat->atime = OSIFILE_INODE(afile)->i_atime.tv_sec;
169 osi_UFSClose(struct osi_file *afile)
171 AFS_STATCNT(osi_Close);
173 if (OSIFILE_INODE(afile)) {
174 filp_close(afile->filp, NULL);
182 osi_UFSTruncate(struct osi_file *afile, afs_int32 asize)
185 struct osi_stat tstat;
186 struct iattr newattrs;
187 struct inode *inode = OSIFILE_INODE(afile);
188 AFS_STATCNT(osi_Truncate);
190 /* This routine only shrinks files, and most systems
191 * have very slow truncates, even when the file is already
192 * small enough. Check now and save some time.
194 code = afs_osi_Stat(afile, &tstat);
195 if (code || tstat.size <= asize)
198 afs_linux_lock_inode(inode);
199 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
200 down_write(&inode->i_alloc_sem);
202 newattrs.ia_size = asize;
203 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
204 AFS_CURRENT_TIME(&newattrs.ia_ctime);
206 /* avoid notify_change() since it wants to update dentry->d_parent */
207 #ifdef HAVE_LINUX_SETATTR_PREPARE
208 code = setattr_prepare(file_dentry(afile->filp), &newattrs);
210 code = inode_change_ok(inode, &newattrs);
213 code = afs_inode_setattr(afile, &newattrs);
215 truncate_inode_pages(&inode->i_data, asize);
217 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
218 up_write(&inode->i_alloc_sem);
220 afs_linux_unlock_inode(inode);
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;
309 (*afile->proc)(afile, code);
315 /* This work should be handled by physstrat in ca/machdep.c.
316 This routine written from the RT NFS port strategy routine.
317 It has been generalized a bit, but should still be pretty clear. */
319 afs_osi_MapStrategy(int (*aproc) (struct buf * bp), struct buf *bp)
321 afs_int32 returnCode;
323 AFS_STATCNT(osi_MapStrategy);
324 returnCode = (*aproc) (bp);
330 shutdown_osifile(void)
332 AFS_STATCNT(shutdown_osifile);
333 if (afs_cold_shutdown) {
334 afs_osicred_initialized = 0;
338 /* Intialize cache device info and fragment size for disk cache partition. */
340 osi_InitCacheInfo(char *aname)
343 extern afs_dcache_id_t cacheInode;
345 extern struct osi_dev cacheDev;
346 extern afs_int32 afs_fsfragsize;
347 extern struct super_block *afs_cacheSBp;
348 extern struct vfsmount *afs_cacheMnt;
349 code = osi_lookupname_internal(aname, 1, &afs_cacheMnt, &dp);
353 osi_get_fh(dp, &cacheInode.ufs);
354 cacheDev.dev = dp->d_inode->i_sb->s_dev;
355 afs_fsfragsize = dp->d_inode->i_sb->s_blocksize - 1;
356 afs_cacheSBp = dp->d_inode->i_sb;
360 afs_init_sb_export_ops(afs_cacheSBp);
367 * seek, then read or write to an open inode. addrp points to data in
371 osi_rdwr(struct osi_file *osifile, struct uio *uiop, int rw)
373 struct file *filp = osifile->filp;
374 #ifdef AFS_FILE_NEEDS_SET_FS
375 mm_segment_t old_fs = {0};
376 #endif /* AFS_FILE_NEEDS_SET_FS */
380 unsigned long savelim;
383 savelim = current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur;
384 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
386 #ifdef AFS_FILE_NEEDS_SET_FS
387 if (uiop->uio_seg == AFS_UIOSYS) {
388 /* Switch into user space */
392 #endif /* AFS_FILE_NEEDS_SET_FS */
394 while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
396 count = iov->iov_len;
403 pos = uiop->uio_offset;
405 code = afs_file_read(filp, iov->iov_base, count, &pos);
407 code = afs_file_write(filp, iov->iov_base, count, &pos);
412 } else if (code == 0) {
414 * This is bad -- we can't read any more data from the
415 * file, but we have no good way of signaling a partial
422 iov->iov_base += code;
423 iov->iov_len -= code;
424 uiop->uio_resid -= code;
425 uiop->uio_offset += code;
429 #ifdef AFS_FILE_NEEDS_SET_FS
430 if (uiop->uio_seg == AFS_UIOSYS) {
431 /* Switch back into kernel space */
434 #endif /* AFS_FILE_NEEDS_SET_FS */
436 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = savelim;
442 * Setup a uio struct.
445 setup_uio(struct uio *uiop, struct iovec *iovecp, const char *buf, afs_offs_t pos,
446 int count, uio_flag_t flag, uio_seg_t seg)
448 iovecp->iov_base = (char *)buf;
449 iovecp->iov_len = count;
450 uiop->uio_iov = iovecp;
451 uiop->uio_iovcnt = 1;
452 uiop->uio_offset = pos;
454 uiop->uio_resid = count;
455 uiop->uio_flag = flag;
460 * UIO_READ : dp -> uio
461 * UIO_WRITE : uio -> dp
464 uiomove(char *dp, int length, uio_flag_t rw, struct uio *uiop)
470 while (length > 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
472 count = iov->iov_len;
483 switch (uiop->uio_seg) {
487 memcpy(iov->iov_base, dp, count);
490 memcpy(dp, iov->iov_base, count);
493 printf("uiomove: Bad rw = %d\n", rw);
500 AFS_COPYOUT(dp, iov->iov_base, count, code);
503 AFS_COPYIN(iov->iov_base, dp, count, code);
506 printf("uiomove: Bad rw = %d\n", rw);
511 printf("uiomove: Bad seg = %d\n", uiop->uio_seg);
517 iov->iov_base += count;
518 iov->iov_len -= count;
519 uiop->uio_offset += count;
520 uiop->uio_resid -= count;