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;
30 #if defined(STRUCT_TASK_HAS_CRED)
31 extern struct cred *cache_creds;
35 afs_linux_raw_open(afs_dcache_id_t *ainode, ino_t *hint)
37 struct inode *tip = NULL;
38 struct dentry *dp = NULL;
41 #if !defined(LINUX_USE_FH)
42 tip = iget(afs_cacheSBp, ainode->ufs);
44 osi_Panic("Can't get inode %d\n", (int) ainode->ufs);
46 dp = d_alloc_anon(tip);
48 dp = afs_cacheSBp->s_export_op->fh_to_dentry(afs_cacheSBp, &ainode->ufs.fh,
49 cache_fh_len, cache_fh_type);
51 osi_Panic("Can't get dentry\n");
54 tip->i_flags |= MS_NOATIME; /* Disable updating access times. */
56 #if defined(STRUCT_TASK_HAS_CRED)
57 /* Use stashed credentials - prevent selinux/apparmor problems */
58 filp = dentry_open(dp, mntget(afs_cacheMnt), O_RDWR, cache_creds);
60 filp = dentry_open(dp, mntget(afs_cacheMnt), O_RDWR);
63 #if defined(LINUX_USE_FH)
64 osi_Panic("Can't open file\n");
66 osi_Panic("Can't open inode %d\n", (int) ainode->ufs);
74 osi_UFSOpen(afs_dcache_id_t *ainode)
76 struct osi_file *afile = NULL;
77 extern int cacheDiskType;
79 AFS_STATCNT(osi_UFSOpen);
80 if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
81 osi_Panic("UFSOpen called for non-UFS cache\n");
83 if (!afs_osicred_initialized) {
84 /* valid for alpha_osf, SunOS, Ultrix */
85 memset(&afs_osi_cred, 0, sizeof(afs_ucred_t));
86 crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */
87 afs_osicred_initialized = 1;
89 afile = (struct osi_file *)osi_AllocLargeSpace(sizeof(struct osi_file));
92 osi_Panic("osi_UFSOpen: Failed to allocate %d bytes for osi_file.\n",
93 (int)sizeof(struct osi_file));
95 memset(afile, 0, sizeof(struct osi_file));
97 afile->filp = afs_linux_raw_open(ainode, &afile->inum);
98 afile->size = i_size_read(FILE_INODE(afile->filp));
101 afile->proc = (int (*)())0;
102 return (void *)afile;
105 #if defined(LINUX_USE_FH)
107 * Given a dentry, return the file handle as encoded by the filesystem.
108 * We can't assume anything about the length (words, not bytes).
109 * The cache has to live on a single filesystem with uniform file
110 * handles, otherwise we panic.
112 void osi_get_fh(struct dentry *dp, afs_ufs_dcache_id_t *ainode) {
116 if (cache_fh_len > 0)
117 max_len = cache_fh_len;
119 max_len = MAX_FH_LEN;
120 if (dp->d_sb->s_export_op->encode_fh) {
121 type = dp->d_sb->s_export_op->encode_fh(dp, &ainode->raw[0], &max_len, 0);
123 osi_Panic("File handle encoding failed\n");
125 if (cache_fh_type < 0)
126 cache_fh_type = type;
127 if (cache_fh_len < 0) {
128 cache_fh_len = max_len;
130 if (type != cache_fh_type || max_len != cache_fh_len) {
131 osi_Panic("Inconsistent file handles within cache\n");
134 /* If fs doesn't provide an encode_fh method, assume the default INO32 type */
135 if (cache_fh_type < 0)
136 cache_fh_type = FILEID_INO32_GEN;
137 if (cache_fh_len < 0)
138 cache_fh_len = sizeof(struct fid)/4;
139 ainode->fh.i32.ino = dp->d_inode->i_ino;
140 ainode->fh.i32.gen = dp->d_inode->i_generation;
144 void osi_get_fh(struct dentry *dp, afs_ufs_dcache_id_t *ainode) {
145 *ainode = dp->d_inode->i_ino;
150 afs_osi_Stat(register struct osi_file *afile, register struct osi_stat *astat)
152 AFS_STATCNT(osi_Stat);
153 ObtainWriteLock(&afs_xosi, 320);
154 astat->size = i_size_read(OSIFILE_INODE(afile));
155 astat->mtime = OSIFILE_INODE(afile)->i_mtime.tv_sec;
156 astat->atime = OSIFILE_INODE(afile)->i_atime.tv_sec;
158 ReleaseWriteLock(&afs_xosi);
163 osi_UFSClose(register struct osi_file *afile)
165 AFS_STATCNT(osi_Close);
167 if (OSIFILE_INODE(afile)) {
168 filp_close(afile->filp, NULL);
172 osi_FreeLargeSpace(afile);
177 osi_UFSTruncate(register struct osi_file *afile, afs_int32 asize)
179 register afs_int32 code;
180 struct osi_stat tstat;
181 struct iattr newattrs;
182 struct inode *inode = OSIFILE_INODE(afile);
183 AFS_STATCNT(osi_Truncate);
185 /* This routine only shrinks files, and most systems
186 * have very slow truncates, even when the file is already
187 * small enough. Check now and save some time.
189 code = afs_osi_Stat(afile, &tstat);
190 if (code || tstat.size <= asize)
192 ObtainWriteLock(&afs_xosi, 321);
194 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
195 down_write(&inode->i_alloc_sem);
197 #ifdef STRUCT_INODE_HAS_I_MUTEX
198 mutex_lock(&inode->i_mutex);
202 newattrs.ia_size = asize;
203 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
204 newattrs.ia_ctime = CURRENT_TIME;
206 /* avoid notify_change() since it wants to update dentry->d_parent */
208 code = inode_change_ok(inode, &newattrs);
210 #ifdef INODE_SETATTR_NOT_VOID
211 if (inode->i_op && inode->i_op->setattr)
212 code = inode->i_op->setattr(afile->filp->f_dentry, &newattrs);
214 code = inode_setattr(inode, &newattrs);
216 inode_setattr(inode, &newattrs);
221 truncate_inode_pages(&inode->i_data, asize);
223 #ifdef STRUCT_INODE_HAS_I_MUTEX
224 mutex_unlock(&inode->i_mutex);
228 #ifdef STRUCT_INODE_HAS_I_ALLOC_SEM
229 up_write(&inode->i_alloc_sem);
232 ReleaseWriteLock(&afs_xosi);
237 /* Generic read interface */
239 afs_osi_Read(register struct osi_file *afile, int offset, void *aptr,
246 AFS_STATCNT(osi_Read);
249 * If the osi_file passed in is NULL, panic only if AFS is not shutting
250 * down. No point in crashing when we are already shutting down
253 if (!afs_shuttingdown)
254 osi_Panic("osi_Read called with null param");
260 afile->offset = offset;
261 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_READ, AFS_UIOSYS);
263 code = osi_rdwr(afile, &auio, UIO_READ);
266 code = asize - auio.uio_resid;
267 afile->offset += code;
269 afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, auio.uio_resid,
270 ICL_TYPE_INT32, code);
276 /* Generic write interface */
278 afs_osi_Write(register struct osi_file *afile, afs_int32 offset, void *aptr,
285 AFS_STATCNT(osi_Write);
288 if (!afs_shuttingdown)
289 osi_Panic("afs_osi_Write called with null param");
295 afile->offset = offset;
296 setup_uio(&auio, &iov, aptr, afile->offset, asize, UIO_WRITE, AFS_UIOSYS);
298 code = osi_rdwr(afile, &auio, UIO_WRITE);
301 code = asize - auio.uio_resid;
302 afile->offset += code;
306 ("\n\n\n*** Cache partition is FULL - Decrease cachesize!!! ***\n\n");
311 (*afile->proc)(afile, code);
317 /* This work should be handled by physstrat in ca/machdep.c.
318 This routine written from the RT NFS port strategy routine.
319 It has been generalized a bit, but should still be pretty clear. */
321 afs_osi_MapStrategy(int (*aproc) (struct buf * bp), register struct buf *bp)
323 afs_int32 returnCode;
325 AFS_STATCNT(osi_MapStrategy);
326 returnCode = (*aproc) (bp);
332 shutdown_osifile(void)
334 AFS_STATCNT(shutdown_osifile);
335 if (afs_cold_shutdown) {
336 afs_osicred_initialized = 0;
340 /* Intialize cache device info and fragment size for disk cache partition. */
342 osi_InitCacheInfo(char *aname)
345 extern afs_dcache_id_t cacheInode;
347 extern struct osi_dev cacheDev;
348 extern afs_int32 afs_fsfragsize;
349 extern struct super_block *afs_cacheSBp;
350 extern struct vfsmount *afs_cacheMnt;
351 code = osi_lookupname_internal(aname, 1, &afs_cacheMnt, &dp);
355 osi_get_fh(dp, &cacheInode.ufs);
356 cacheDev.dev = dp->d_inode->i_sb->s_dev;
357 afs_fsfragsize = dp->d_inode->i_sb->s_blocksize - 1;
358 afs_cacheSBp = dp->d_inode->i_sb;
366 #define FOP_READ(F, B, C) (F)->f_op->read(F, B, (size_t)(C), &(F)->f_pos)
367 #define FOP_WRITE(F, B, C) (F)->f_op->write(F, B, (size_t)(C), &(F)->f_pos)
370 * seek, then read or write to an open inode. addrp points to data in
374 osi_rdwr(struct osi_file *osifile, uio_t * uiop, int rw)
376 struct file *filp = osifile->filp;
381 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 if (uiop->uio_seg == AFS_UIOSYS)
389 /* seek to the desired position. Return -1 on error. */
390 if (filp->f_op->llseek) {
391 if (filp->f_op->llseek(filp, (loff_t) uiop->uio_offset, 0) != uiop->uio_offset)
394 filp->f_pos = uiop->uio_offset;
396 while (code == 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
398 count = iov->iov_len;
406 code = FOP_READ(filp, iov->iov_base, count);
408 code = FOP_WRITE(filp, iov->iov_base, count);
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 if (uiop->uio_seg == AFS_UIOSYS)
433 current->TASK_STRUCT_RLIM[RLIMIT_FSIZE].rlim_cur = savelim;
439 * Setup a uio struct.
442 setup_uio(uio_t * uiop, struct iovec *iovecp, const char *buf, afs_offs_t pos,
443 int count, uio_flag_t flag, uio_seg_t seg)
445 iovecp->iov_base = (char *)buf;
446 iovecp->iov_len = count;
447 uiop->uio_iov = iovecp;
448 uiop->uio_iovcnt = 1;
449 uiop->uio_offset = pos;
451 uiop->uio_resid = count;
452 uiop->uio_flag = flag;
457 * UIO_READ : dp -> uio
458 * UIO_WRITE : uio -> dp
461 uiomove(char *dp, int length, uio_flag_t rw, uio_t * uiop)
467 while (length > 0 && uiop->uio_resid > 0 && uiop->uio_iovcnt > 0) {
469 count = iov->iov_len;
480 switch (uiop->uio_seg) {
484 memcpy(iov->iov_base, dp, count);
487 memcpy(dp, iov->iov_base, count);
490 printf("uiomove: Bad rw = %d\n", rw);
497 AFS_COPYOUT(dp, iov->iov_base, count, code);
500 AFS_COPYIN(iov->iov_base, dp, count, code);
503 printf("uiomove: Bad rw = %d\n", rw);
508 printf("uiomove: Bad seg = %d\n", uiop->uio_seg);
514 iov->iov_base += count;
515 iov->iov_len -= count;
516 uiop->uio_offset += count;
517 uiop->uio_resid -= count;