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/smp_lock.h>
19 #include <linux/namei.h>
20 #if defined(LINUX_USE_FH)
21 #include <linux/exportfs.h>
22 int cache_fh_type = -1;
23 int cache_fh_len = -1;
26 afs_lock_t afs_xosi; /* lock is for tvattr */
27 extern struct osi_dev cacheDev;
28 extern struct vfsmount *afs_cacheMnt;
29 extern struct super_block *afs_cacheSBp;
32 afs_linux_raw_open(afs_dcache_id_t *ainode, ino_t *hint)
34 struct inode *tip = NULL;
35 struct dentry *dp = NULL;
38 #if !defined(LINUX_USE_FH)
39 tip = iget(afs_cacheSBp, ainode->ufs);
41 osi_Panic("Can't get inode %d\n", (int) ainode->ufs);
43 dp = d_alloc_anon(tip);
45 dp = afs_cacheSBp->s_export_op->fh_to_dentry(afs_cacheSBp, &ainode->ufs.fh,
46 cache_fh_len, cache_fh_type);
48 osi_Panic("Can't get dentry\n");
51 tip->i_flags |= MS_NOATIME; /* Disable updating access times. */
53 #if defined(STRUCT_TASK_HAS_CRED)
54 filp = dentry_open(dp, mntget(afs_cacheMnt), O_RDWR, current_cred());
56 filp = dentry_open(dp, mntget(afs_cacheMnt), O_RDWR);
59 #if defined(LINUX_USE_FH)
60 osi_Panic("Can't open file\n");
62 osi_Panic("Can't open inode %d\n", (int) ainode->ufs);
70 osi_UFSOpen(afs_dcache_id_t *ainode)
72 struct osi_file *afile = NULL;
73 extern int cacheDiskType;
75 AFS_STATCNT(osi_UFSOpen);
76 if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
77 osi_Panic("UFSOpen called for non-UFS cache\n");
79 if (!afs_osicred_initialized) {
80 /* valid for alpha_osf, SunOS, Ultrix */
81 memset((char *)&afs_osi_cred, 0, sizeof(afs_ucred_t));
82 crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */
83 afs_osicred_initialized = 1;
85 afile = (struct osi_file *)osi_AllocLargeSpace(sizeof(struct osi_file));
88 osi_Panic("osi_UFSOpen: Failed to allocate %d bytes for osi_file.\n",
89 (int)sizeof(struct osi_file));
91 memset(afile, 0, sizeof(struct osi_file));
93 afile->filp = afs_linux_raw_open(ainode, &afile->inum);
94 afile->size = i_size_read(FILE_INODE(afile->filp));
97 afile->proc = (int (*)())0;
101 #if defined(LINUX_USE_FH)
103 * Given a dentry, return the file handle as encoded by the filesystem.
104 * We can't assume anything about the length (words, not bytes).
105 * The cache has to live on a single filesystem with uniform file
106 * handles, otherwise we panic.
108 void osi_get_fh(struct dentry *dp, afs_ufs_dcache_id_t *ainode) {
112 if (cache_fh_len > 0)
113 max_len = cache_fh_len;
115 max_len = MAX_FH_LEN;
116 if (dp->d_sb->s_export_op->encode_fh) {
117 type = dp->d_sb->s_export_op->encode_fh(dp, &ainode->raw[0], &max_len, 0);
119 osi_Panic("File handle encoding failed\n");
121 if (cache_fh_type < 0)
122 cache_fh_type = type;
123 if (cache_fh_len < 0) {
124 cache_fh_len = max_len;
126 if (type != cache_fh_type || max_len != cache_fh_len) {
127 osi_Panic("Inconsistent file handles within cache\n");
130 /* If fs doesn't provide an encode_fh method, assume the default INO32 type */
131 if (cache_fh_type < 0)
132 cache_fh_type = FILEID_INO32_GEN;
133 if (cache_fh_len < 0)
134 cache_fh_len = sizeof(struct fid)/4;
135 ainode->fh.i32.ino = dp->d_inode->i_ino;
136 ainode->fh.i32.gen = dp->d_inode->i_generation;
140 void osi_get_fh(struct dentry *dp, afs_ufs_dcache_id_t *ainode) {
141 *ainode = dp->d_inode->i_ino;
146 afs_osi_Stat(register struct osi_file *afile, register struct osi_stat *astat)
148 AFS_STATCNT(osi_Stat);
149 MObtainWriteLock(&afs_xosi, 320);
150 astat->size = i_size_read(OSIFILE_INODE(afile));
151 astat->mtime = OSIFILE_INODE(afile)->i_mtime.tv_sec;
152 astat->atime = OSIFILE_INODE(afile)->i_atime.tv_sec;
154 MReleaseWriteLock(&afs_xosi);
159 osi_UFSClose(register struct osi_file *afile)
161 AFS_STATCNT(osi_Close);
163 if (OSIFILE_INODE(afile)) {
164 filp_close(afile->filp, NULL);
168 osi_FreeLargeSpace(afile);
173 osi_UFSTruncate(register struct osi_file *afile, afs_int32 asize)
175 register afs_int32 code;
176 struct osi_stat tstat;
177 struct iattr newattrs;
178 struct inode *inode = OSIFILE_INODE(afile);
179 AFS_STATCNT(osi_Truncate);
181 /* This routine only shrinks files, and most systems
182 * have very slow truncates, even when the file is already
183 * small enough. Check now and save some time.
185 code = afs_osi_Stat(afile, &tstat);
186 if (code || tstat.size <= asize)
188 MObtainWriteLock(&afs_xosi, 321);
190 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
191 down_write(&inode->i_alloc_sem);
193 #ifdef STRUCT_INODE_HAS_I_MUTEX
194 mutex_lock(&inode->i_mutex);
198 newattrs.ia_size = asize;
199 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
200 newattrs.ia_ctime = CURRENT_TIME;
202 /* avoid notify_change() since it wants to update dentry->d_parent */
204 code = inode_change_ok(inode, &newattrs);
206 #ifdef INODE_SETATTR_NOT_VOID
207 if (inode->i_op && inode->i_op->setattr)
208 code = inode->i_op->setattr(afile->filp->f_dentry, &newattrs);
210 code = inode_setattr(inode, &newattrs);
212 inode_setattr(inode, &newattrs);
217 truncate_inode_pages(&inode->i_data, asize);
219 #ifdef STRUCT_INODE_HAS_I_MUTEX
220 mutex_unlock(&inode->i_mutex);
224 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
225 up_write(&inode->i_alloc_sem);
228 MReleaseWriteLock(&afs_xosi);
233 /* Generic read interface */
235 afs_osi_Read(register struct osi_file *afile, int offset, void *aptr,
242 AFS_STATCNT(osi_Read);
245 * If the osi_file passed in is NULL, panic only if AFS is not shutting
246 * down. No point in crashing when we are already shutting down
249 if (!afs_shuttingdown)
250 osi_Panic("osi_Read called with null param");
256 afile->offset = offset;
257 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_READ, AFS_UIOSYS);
259 code = osi_rdwr(afile, &auio, UIO_READ);
262 code = asize - auio.uio_resid;
263 afile->offset += code;
265 afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, auio.uio_resid,
266 ICL_TYPE_INT32, code);
272 /* Generic write interface */
274 afs_osi_Write(register struct osi_file *afile, afs_int32 offset, void *aptr,
281 AFS_STATCNT(osi_Write);
284 if (!afs_shuttingdown)
285 osi_Panic("afs_osi_Write called with null param");
291 afile->offset = offset;
292 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_WRITE, AFS_UIOSYS);
294 code = osi_rdwr(afile, &auio, UIO_WRITE);
297 code = asize - auio.uio_resid;
298 afile->offset += code;
302 ("\n\n\n*** Cache partition is FULL - Decrease cachesize!!! ***\n\n");
307 (*afile->proc)(afile, code);
313 /* This work should be handled by physstrat in ca/machdep.c.
314 This routine written from the RT NFS port strategy routine.
315 It has been generalized a bit, but should still be pretty clear. */
317 afs_osi_MapStrategy(int (*aproc) (struct buf * bp), register struct buf *bp)
319 afs_int32 returnCode;
321 AFS_STATCNT(osi_MapStrategy);
322 returnCode = (*aproc) (bp);
328 shutdown_osifile(void)
330 AFS_STATCNT(shutdown_osifile);
331 if (afs_cold_shutdown) {
332 afs_osicred_initialized = 0;
336 /* Intialize cache device info and fragment size for disk cache partition. */
338 osi_InitCacheInfo(char *aname)
341 extern afs_dcache_id_t cacheInode;
343 extern struct osi_dev cacheDev;
344 extern afs_int32 afs_fsfragsize;
345 extern struct super_block *afs_cacheSBp;
346 extern struct vfsmount *afs_cacheMnt;
347 code = osi_lookupname_internal(aname, 1, &afs_cacheMnt, &dp);
351 osi_get_fh(dp, &cacheInode.ufs);
352 cacheDev.dev = dp->d_inode->i_sb->s_dev;
353 afs_fsfragsize = dp->d_inode->i_sb->s_blocksize - 1;
354 afs_cacheSBp = dp->d_inode->i_sb;
362 #define FOP_READ(F, B, C) (F)->f_op->read(F, B, (size_t)(C), &(F)->f_pos)
363 #define FOP_WRITE(F, B, C) (F)->f_op->write(F, B, (size_t)(C), &(F)->f_pos)
366 * seek, then read or write to an open inode. addrp points to data in
370 osi_rdwr(struct osi_file *osifile, uio_t * uiop, int rw)
372 struct file *filp = osifile->filp;
377 unsigned long savelim;
379 savelim = current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur;
380 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
382 if (uiop->uio_seg == AFS_UIOSYS)
385 /* seek to the desired position. Return -1 on error. */
386 if (filp->f_op->llseek) {
387 if (filp->f_op->llseek(filp, (loff_t) uiop->uio_offset, 0) != uiop->uio_offset)
390 filp->f_pos = uiop->uio_offset;
392 while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
394 count = iov->iov_len;
402 code = FOP_READ(filp, iov->iov_base, count);
404 code = FOP_WRITE(filp, iov->iov_base, count);
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 if (uiop->uio_seg == AFS_UIOSYS)
429 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = savelim;
435 * Setup a uio struct.
438 setup_uio(uio_t * uiop, struct iovec *iovecp, const char *buf, afs_offs_t pos,
439 int count, uio_flag_t flag, uio_seg_t seg)
441 iovecp->iov_base = (char *)buf;
442 iovecp->iov_len = count;
443 uiop->uio_iov = iovecp;
444 uiop->uio_iovcnt = 1;
445 uiop->uio_offset = pos;
447 uiop->uio_resid = count;
448 uiop->uio_flag = flag;
453 * UIO_READ : dp -> uio
454 * UIO_WRITE : uio -> dp
457 uiomove(char *dp, int length, uio_flag_t rw, uio_t * uiop)
463 while (length > 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
465 count = iov->iov_len;
476 switch (uiop->uio_seg) {
480 memcpy(iov->iov_base, dp, count);
483 memcpy(dp, iov->iov_base, count);
486 printf("uiomove: Bad rw = %d\n", rw);
493 AFS_COPYOUT(dp, iov->iov_base, count, code);
496 AFS_COPYIN(iov->iov_base, dp, count, code);
499 printf("uiomove: Bad rw = %d\n", rw);
504 printf("uiomove: Bad seg = %d\n", uiop->uio_seg);
510 iov->iov_base += count;
511 iov->iov_len -= count;
512 uiop->uio_offset += count;
513 uiop->uio_resid -= count;