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
11 * Linux specific vnodeops. Also includes the glue routines required to call
14 * So far the only truly scary part is that Linux relies on the inode cache
15 * to be up to date. Don't you dare break a callback and expect an fstat
16 * to give you meaningful information. This appears to be fixed in the 2.1
17 * development kernels. As it is we can fix this now by intercepting the
21 #include <afsconfig.h>
22 #include "afs/param.h"
25 #include "afs/sysincludes.h"
26 #include "afsincludes.h"
27 #include "afs/afs_stats.h"
29 #ifdef HAVE_MM_INLINE_H
30 #include "h/mm_inline.h"
32 #include "h/pagemap.h"
33 #if defined(AFS_LINUX24_ENV)
34 #include "h/smp_lock.h"
36 #if defined(AFS_CACHE_BYPASS)
38 #include "afs/afs_bypasscache.h"
41 #include "osi_pagecopy.h"
44 #define pageoff(pp) pgoff2loff((pp)->index)
46 #define pageoff(pp) pp->offset
49 #ifndef HAVE_PAGEVEC_LRU_ADD_FILE
50 #define __pagevec_lru_add_file __pagevec_lru_add
54 #define MAX_ERRNO 1000L
57 extern struct vcache *afs_globalVp;
58 extern int afs_notify_change(struct dentry *dp, struct iattr *iattrp);
59 #if defined(AFS_LINUX24_ENV)
60 /* Some uses of BKL are perhaps not needed for bypass or memcache--
61 * why don't we try it out? */
62 extern struct afs_cacheOps afs_UfsCacheOps;
63 #define maybe_lock_kernel() \
65 if(afs_cacheType == &afs_UfsCacheOps) \
70 #define maybe_unlock_kernel() \
72 if(afs_cacheType == &afs_UfsCacheOps) \
75 #endif /* AFS_LINUX24_ENV */
78 /* This function converts a positive error code from AFS into a negative
79 * code suitable for passing into the Linux VFS layer. It checks that the
80 * error code is within the permissable bounds for the ERR_PTR mechanism.
82 * _All_ error codes which come from the AFS layer should be passed through
83 * this function before being returned to the kernel.
86 static inline int afs_convert_code(int code) {
87 if ((code >= 0) && (code <= MAX_ERRNO))
93 /* Linux doesn't require a credp for many functions, and crref is an expensive
94 * operation. This helper function avoids obtaining it for VerifyVCache calls
97 static inline int afs_linux_VerifyVCache(struct vcache *avc, cred_t **retcred) {
102 if (avc->f.states & CStatd) {
110 code = afs_InitReq(&treq, credp);
112 code = afs_VerifyVCache2(avc, &treq);
119 return afs_convert_code(code);
123 afs_linux_read(struct file *fp, char *buf, size_t count, loff_t * offp)
126 struct vcache *vcp = VTOAFS(fp->f_dentry->d_inode);
127 #if defined(AFS_CACHE_BYPASS) && LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
128 afs_size_t isize, offindex;
132 afs_Trace4(afs_iclSetp, CM_TRACE_READOP, ICL_TYPE_POINTER, vcp,
133 ICL_TYPE_OFFSET, offp, ICL_TYPE_INT32, count, ICL_TYPE_INT32,
135 code = afs_linux_VerifyVCache(vcp, NULL);
138 #if defined(AFS_CACHE_BYPASS) && LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
139 isize = (i_size_read(fp->f_mapping->host) - 1) >> PAGE_CACHE_SHIFT;
140 offindex = *offp >> PAGE_CACHE_SHIFT;
141 if(offindex > isize) {
146 /* Linux's FlushPages implementation doesn't ever use credp,
147 * so we optimise by not using it */
148 osi_FlushPages(vcp, NULL); /* ensure stale pages are gone */
151 code = do_sync_read(fp, buf, count, offp);
153 code = generic_file_read(fp, buf, count, offp);
158 afs_Trace4(afs_iclSetp, CM_TRACE_READOP, ICL_TYPE_POINTER, vcp,
159 ICL_TYPE_OFFSET, offp, ICL_TYPE_INT32, count, ICL_TYPE_INT32,
161 #if defined(AFS_CACHE_BYPASS) && LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
169 /* Now we have integrated VM for writes as well as reads. generic_file_write
170 * also takes care of re-positioning the pointer if file is open in append
171 * mode. Call fake open/close to ensure we do writes of core dumps.
174 afs_linux_write(struct file *fp, const char *buf, size_t count, loff_t * offp)
177 struct vcache *vcp = VTOAFS(fp->f_dentry->d_inode);
182 afs_Trace4(afs_iclSetp, CM_TRACE_WRITEOP, ICL_TYPE_POINTER, vcp,
183 ICL_TYPE_OFFSET, offp, ICL_TYPE_INT32, count, ICL_TYPE_INT32,
184 (fp->f_flags & O_APPEND) ? 99998 : 99999);
186 code = afs_linux_VerifyVCache(vcp, &credp);
188 ObtainWriteLock(&vcp->lock, 529);
190 ReleaseWriteLock(&vcp->lock);
194 code = do_sync_write(fp, buf, count, offp);
196 code = generic_file_write(fp, buf, count, offp);
201 ObtainWriteLock(&vcp->lock, 530);
203 if (vcp->execsOrWriters == 1 && !credp)
206 afs_FakeClose(vcp, credp);
207 ReleaseWriteLock(&vcp->lock);
209 afs_Trace4(afs_iclSetp, CM_TRACE_WRITEOP, ICL_TYPE_POINTER, vcp,
210 ICL_TYPE_OFFSET, offp, ICL_TYPE_INT32, count, ICL_TYPE_INT32,
219 extern int BlobScan(struct dcache * afile, afs_int32 ablob);
221 /* This is a complete rewrite of afs_readdir, since we can make use of
222 * filldir instead of afs_readdir_move. Note that changes to vcache/dcache
223 * handling and use of bulkstats will need to be reflected here as well.
226 afs_linux_readdir(struct file *fp, void *dirbuf, filldir_t filldir)
228 struct vcache *avc = VTOAFS(FILE_INODE(fp));
229 struct vrequest treq;
230 register struct dcache *tdc;
237 afs_size_t origOffset, tlen;
238 cred_t *credp = crref();
239 struct afs_fakestat_state fakestat;
242 AFS_STATCNT(afs_readdir);
244 code = afs_convert_code(afs_InitReq(&treq, credp));
249 afs_InitFakeStat(&fakestat);
250 code = afs_convert_code(afs_EvalFakeStat(&avc, &fakestat, &treq));
254 /* update the cache entry */
256 code = afs_convert_code(afs_VerifyVCache2(avc, &treq));
260 /* get a reference to the entire directory */
261 tdc = afs_GetDCache(avc, (afs_size_t) 0, &treq, &origOffset, &tlen, 1);
267 ObtainSharedLock(&avc->lock, 810);
268 UpgradeSToWLock(&avc->lock, 811);
269 ObtainReadLock(&tdc->lock);
271 * Make sure that the data in the cache is current. There are two
272 * cases we need to worry about:
273 * 1. The cache data is being fetched by another process.
274 * 2. The cache data is no longer valid
276 while ((avc->f.states & CStatd)
277 && (tdc->dflags & DFFetching)
278 && hsame(avc->f.m.DataVersion, tdc->f.versionNo)) {
279 ReleaseReadLock(&tdc->lock);
280 ReleaseSharedLock(&avc->lock);
281 afs_osi_Sleep(&tdc->validPos);
282 ObtainSharedLock(&avc->lock, 812);
283 ObtainReadLock(&tdc->lock);
285 if (!(avc->f.states & CStatd)
286 || !hsame(avc->f.m.DataVersion, tdc->f.versionNo)) {
287 ReleaseReadLock(&tdc->lock);
288 ReleaseSharedLock(&avc->lock);
293 /* Set the readdir-in-progress flag, and downgrade the lock
294 * to shared so others will be able to acquire a read lock.
296 avc->f.states |= CReadDir;
297 avc->dcreaddir = tdc;
298 avc->readdir_pid = MyPidxx2Pid(MyPidxx);
299 ConvertWToSLock(&avc->lock);
301 /* Fill in until we get an error or we're done. This implementation
302 * takes an offset in units of blobs, rather than bytes.
305 offset = (int) fp->f_pos;
307 dirpos = BlobScan(tdc, offset);
311 de = afs_dir_GetBlob(tdc, dirpos);
315 ino = afs_calc_inum (avc->f.fid.Fid.Volume, ntohl(de->fid.vnode));
318 len = strlen(de->name);
320 printf("afs_linux_readdir: afs_dir_GetBlob failed, null name (inode %lx, dirpos %d)\n",
321 (unsigned long)&tdc->f.inode, dirpos);
323 ReleaseSharedLock(&avc->lock);
329 /* filldir returns -EINVAL when the buffer is full. */
330 #if (defined(AFS_LINUX24_ENV) || defined(pgoff2loff)) && defined(DECLARE_FSTYPE)
332 unsigned int type = DT_UNKNOWN;
333 struct VenusFid afid;
336 afid.Cell = avc->f.fid.Cell;
337 afid.Fid.Volume = avc->f.fid.Fid.Volume;
338 afid.Fid.Vnode = ntohl(de->fid.vnode);
339 afid.Fid.Unique = ntohl(de->fid.vunique);
340 if ((avc->f.states & CForeign) == 0 && (ntohl(de->fid.vnode) & 1)) {
342 } else if ((tvc = afs_FindVCache(&afid, 0, 0))) {
345 } else if (((tvc->f.states) & (CStatd | CTruth))) {
346 /* CTruth will be set if the object has
351 else if (vtype == VREG)
353 /* Don't do this until we're sure it can't be a mtpt */
354 /* else if (vtype == VLNK)
356 /* what other types does AFS support? */
358 /* clean up from afs_FindVCache */
362 * If this is NFS readdirplus, then the filler is going to
363 * call getattr on this inode, which will deadlock if we're
367 code = (*filldir) (dirbuf, de->name, len, offset, ino, type);
371 code = (*filldir) (dirbuf, de->name, len, offset, ino);
376 offset = dirpos + 1 + ((len + 16) >> 5);
378 /* If filldir didn't fill in the last one this is still pointing to that
381 fp->f_pos = (loff_t) offset;
383 ReleaseReadLock(&tdc->lock);
385 UpgradeSToWLock(&avc->lock, 813);
386 avc->f.states &= ~CReadDir;
388 avc->readdir_pid = 0;
389 ReleaseSharedLock(&avc->lock);
393 afs_PutFakeStat(&fakestat);
400 /* in afs_pioctl.c */
401 extern int afs_xioctl(struct inode *ip, struct file *fp, unsigned int com,
404 #if defined(HAVE_UNLOCKED_IOCTL) || defined(HAVE_COMPAT_IOCTL)
405 static long afs_unlocked_xioctl(struct file *fp, unsigned int com,
407 return afs_xioctl(FILE_INODE(fp), fp, com, arg);
414 afs_linux_mmap(struct file *fp, struct vm_area_struct *vmap)
416 struct vcache *vcp = VTOAFS(FILE_INODE(fp));
420 #if defined(AFS_LINUX24_ENV)
421 afs_Trace3(afs_iclSetp, CM_TRACE_GMAP, ICL_TYPE_POINTER, vcp,
422 ICL_TYPE_POINTER, vmap->vm_start, ICL_TYPE_INT32,
423 vmap->vm_end - vmap->vm_start);
425 afs_Trace4(afs_iclSetp, CM_TRACE_GMAP, ICL_TYPE_POINTER, vcp,
426 ICL_TYPE_POINTER, vmap->vm_start, ICL_TYPE_INT32,
427 vmap->vm_end - vmap->vm_start, ICL_TYPE_INT32,
431 /* get a validated vcache entry */
432 code = afs_linux_VerifyVCache(vcp, NULL);
434 /* Linux's Flushpage implementation doesn't use credp, so optimise
435 * our code to not need to crref() it */
436 osi_FlushPages(vcp, NULL); /* ensure stale pages are gone */
438 code = generic_file_mmap(fp, vmap);
441 vcp->f.states |= CMAPPED;
448 afs_linux_open(struct inode *ip, struct file *fp)
450 struct vcache *vcp = VTOAFS(ip);
451 cred_t *credp = crref();
454 #ifdef AFS_LINUX24_ENV
458 code = afs_open(&vcp, fp->f_flags, credp);
460 #ifdef AFS_LINUX24_ENV
461 maybe_unlock_kernel();
465 return afs_convert_code(code);
469 afs_linux_release(struct inode *ip, struct file *fp)
471 struct vcache *vcp = VTOAFS(ip);
472 cred_t *credp = crref();
475 #ifdef AFS_LINUX24_ENV
479 code = afs_close(vcp, fp->f_flags, credp);
481 #ifdef AFS_LINUX24_ENV
482 maybe_unlock_kernel();
486 return afs_convert_code(code);
490 #if defined(AFS_LINUX24_ENV)
491 afs_linux_fsync(struct file *fp, struct dentry *dp, int datasync)
493 afs_linux_fsync(struct file *fp, struct dentry *dp)
497 struct inode *ip = FILE_INODE(fp);
498 cred_t *credp = crref();
500 #ifdef AFS_LINUX24_ENV
504 code = afs_fsync(VTOAFS(ip), credp);
506 #ifdef AFS_LINUX24_ENV
507 maybe_unlock_kernel();
510 return afs_convert_code(code);
516 afs_linux_lock(struct file *fp, int cmd, struct file_lock *flp)
519 struct vcache *vcp = VTOAFS(FILE_INODE(fp));
520 cred_t *credp = crref();
521 struct AFS_FLOCK flock;
522 #if defined(POSIX_TEST_LOCK_CONFLICT_ARG)
523 struct file_lock conflict;
524 #elif defined(POSIX_TEST_LOCK_RETURNS_CONFLICT)
525 struct file_lock *conflict;
528 /* Convert to a lock format afs_lockctl understands. */
529 memset(&flock, 0, sizeof(flock));
530 flock.l_type = flp->fl_type;
531 flock.l_pid = flp->fl_pid;
533 flock.l_start = flp->fl_start;
534 flock.l_len = flp->fl_end - flp->fl_start + 1;
536 /* Safe because there are no large files, yet */
537 #if defined(F_GETLK64) && (F_GETLK != F_GETLK64)
538 if (cmd == F_GETLK64)
540 else if (cmd == F_SETLK64)
542 else if (cmd == F_SETLKW64)
544 #endif /* F_GETLK64 && F_GETLK != F_GETLK64 */
547 code = afs_lockctl(vcp, &flock, cmd, credp);
550 #ifdef AFS_LINUX24_ENV
551 if ((code == 0 || flp->fl_type == F_UNLCK) &&
552 (cmd == F_SETLK || cmd == F_SETLKW)) {
553 # ifdef POSIX_LOCK_FILE_WAIT_ARG
554 code = posix_lock_file(fp, flp, 0);
556 flp->fl_flags &=~ FL_SLEEP;
557 code = posix_lock_file(fp, flp);
559 if (code && flp->fl_type != F_UNLCK) {
560 struct AFS_FLOCK flock2;
562 flock2.l_type = F_UNLCK;
564 afs_lockctl(vcp, &flock2, F_SETLK, credp);
568 /* If lockctl says there are no conflicting locks, then also check with the
569 * kernel, as lockctl knows nothing about byte range locks
571 if (code == 0 && cmd == F_GETLK && flock.l_type == F_UNLCK) {
572 # if defined(POSIX_TEST_LOCK_CONFLICT_ARG)
573 if (posix_test_lock(fp, flp, &conflict)) {
574 locks_copy_lock(flp, &conflict);
575 flp->fl_type = F_UNLCK;
579 # elif defined(POSIX_TEST_LOCK_RETURNS_CONFLICT)
580 if ((conflict = posix_test_lock(fp, flp))) {
581 locks_copy_lock(flp, conflict);
582 flp->fl_type = F_UNLCK;
587 posix_test_lock(fp, flp);
588 /* If we found a lock in the kernel's structure, return it */
589 if (flp->fl_type != F_UNLCK) {
597 /* Convert flock back to Linux's file_lock */
598 flp->fl_type = flock.l_type;
599 flp->fl_pid = flock.l_pid;
600 flp->fl_start = flock.l_start;
601 flp->fl_end = flock.l_start + flock.l_len - 1;
604 return afs_convert_code(code);
607 #ifdef STRUCT_FILE_OPERATIONS_HAS_FLOCK
609 afs_linux_flock(struct file *fp, int cmd, struct file_lock *flp) {
611 struct vcache *vcp = VTOAFS(FILE_INODE(fp));
612 cred_t *credp = crref();
613 struct AFS_FLOCK flock;
614 /* Convert to a lock format afs_lockctl understands. */
615 memset(&flock, 0, sizeof(flock));
616 flock.l_type = flp->fl_type;
617 flock.l_pid = flp->fl_pid;
620 flock.l_len = OFFSET_MAX;
622 /* Safe because there are no large files, yet */
623 #if defined(F_GETLK64) && (F_GETLK != F_GETLK64)
624 if (cmd == F_GETLK64)
626 else if (cmd == F_SETLK64)
628 else if (cmd == F_SETLKW64)
630 #endif /* F_GETLK64 && F_GETLK != F_GETLK64 */
633 code = afs_lockctl(vcp, &flock, cmd, credp);
636 if ((code == 0 || flp->fl_type == F_UNLCK) &&
637 (cmd == F_SETLK || cmd == F_SETLKW)) {
638 flp->fl_flags &=~ FL_SLEEP;
639 code = flock_lock_file_wait(fp, flp);
640 if (code && flp->fl_type != F_UNLCK) {
641 struct AFS_FLOCK flock2;
643 flock2.l_type = F_UNLCK;
645 afs_lockctl(vcp, &flock2, F_SETLK, credp);
649 /* Convert flock back to Linux's file_lock */
650 flp->fl_type = flock.l_type;
651 flp->fl_pid = flock.l_pid;
654 return afs_convert_code(code);
659 * essentially the same as afs_fsync() but we need to get the return
660 * code for the sys_close() here, not afs_linux_release(), so call
661 * afs_StoreAllSegments() with AFS_LASTSTORE
664 #if defined(FOP_FLUSH_TAKES_FL_OWNER_T)
665 afs_linux_flush(struct file *fp, fl_owner_t id)
667 afs_linux_flush(struct file *fp)
670 struct vrequest treq;
674 #if defined(AFS_CACHE_BYPASS)
680 if ((fp->f_flags & O_ACCMODE) == O_RDONLY) { /* readers dont flush */
688 vcp = VTOAFS(FILE_INODE(fp));
690 code = afs_InitReq(&treq, credp);
693 #if defined(AFS_CACHE_BYPASS)
694 /* If caching is bypassed for this file, or globally, just return 0 */
695 if(cache_bypass_strategy == ALWAYS_BYPASS_CACHE)
698 ObtainReadLock(&vcp->lock);
699 if(vcp->cachingStates & FCSBypass)
701 ReleaseReadLock(&vcp->lock);
704 /* future proof: don't rely on 0 return from afs_InitReq */
709 ObtainSharedLock(&vcp->lock, 535);
710 if ((vcp->execsOrWriters > 0) && (file_count(fp) == 1)) {
711 UpgradeSToWLock(&vcp->lock, 536);
712 if (!AFS_IS_DISCONNECTED) {
713 code = afs_StoreAllSegments(vcp,
715 AFS_SYNC | AFS_LASTSTORE);
717 afs_DisconAddDirty(vcp, VDisconWriteOsiFlush, 1);
719 ConvertWToSLock(&vcp->lock);
721 code = afs_CheckCode(code, &treq, 54);
722 ReleaseSharedLock(&vcp->lock);
729 return afs_convert_code(code);
732 #if !defined(AFS_LINUX24_ENV)
733 /* Not allowed to directly read a directory. */
735 afs_linux_dir_read(struct file * fp, char *buf, size_t count, loff_t * ppos)
743 struct file_operations afs_dir_fops = {
744 #if !defined(AFS_LINUX24_ENV)
745 .read = afs_linux_dir_read,
746 .lock = afs_linux_lock,
747 .fsync = afs_linux_fsync,
749 .read = generic_read_dir,
751 .readdir = afs_linux_readdir,
752 #ifdef HAVE_UNLOCKED_IOCTL
753 .unlocked_ioctl = afs_unlocked_xioctl,
757 #ifdef HAVE_COMPAT_IOCTL
758 .compat_ioctl = afs_unlocked_xioctl,
760 .open = afs_linux_open,
761 .release = afs_linux_release,
764 struct file_operations afs_file_fops = {
765 .read = afs_linux_read,
766 .write = afs_linux_write,
767 #ifdef GENERIC_FILE_AIO_READ
768 .aio_read = generic_file_aio_read,
769 .aio_write = generic_file_aio_write,
771 #ifdef HAVE_UNLOCKED_IOCTL
772 .unlocked_ioctl = afs_unlocked_xioctl,
776 #ifdef HAVE_COMPAT_IOCTL
777 .compat_ioctl = afs_unlocked_xioctl,
779 .mmap = afs_linux_mmap,
780 .open = afs_linux_open,
781 .flush = afs_linux_flush,
782 .release = afs_linux_release,
783 .fsync = afs_linux_fsync,
784 .lock = afs_linux_lock,
785 #ifdef STRUCT_FILE_OPERATIONS_HAS_FLOCK
786 .flock = afs_linux_flock,
791 /**********************************************************************
792 * AFS Linux dentry operations
793 **********************************************************************/
795 /* check_bad_parent() : Checks if this dentry's vcache is a root vcache
796 * that has its mvid (parent dir's fid) pointer set to the wrong directory
797 * due to being mounted in multiple points at once. If so, check_bad_parent()
798 * calls afs_lookup() to correct the vcache's mvid, as well as the volume's
799 * dotdotfid and mtpoint fid members.
801 * dp - dentry to be checked.
805 * This dentry's vcache's mvid will be set to the correct parent directory's
807 * This root vnode's volume will have its dotdotfid and mtpoint fids set
808 * to the correct parent and mountpoint fids.
812 check_bad_parent(struct dentry *dp)
815 struct vcache *vcp = VTOAFS(dp->d_inode), *avc = NULL;
816 struct vcache *pvc = VTOAFS(dp->d_parent->d_inode);
818 if (vcp->mvid->Fid.Volume != pvc->f.fid.Fid.Volume) { /* bad parent */
821 /* force a lookup, so vcp->mvid is fixed up */
822 afs_lookup(pvc, (char *)dp->d_name.name, &avc, credp);
823 if (!avc || vcp != avc) { /* bad, very bad.. */
824 afs_Trace4(afs_iclSetp, CM_TRACE_TMP_1S3L, ICL_TYPE_STRING,
825 "check_bad_parent: bad pointer returned from afs_lookup origvc newvc dentry",
826 ICL_TYPE_POINTER, vcp, ICL_TYPE_POINTER, avc,
827 ICL_TYPE_POINTER, dp);
830 AFS_RELE(AFSTOV(avc));
837 /* afs_linux_revalidate
838 * Ensure vcache is stat'd before use. Return 0 if entry is valid.
841 afs_linux_revalidate(struct dentry *dp)
844 struct vcache *vcp = VTOAFS(dp->d_inode);
848 if (afs_shuttingdown)
851 #ifdef AFS_LINUX24_ENV
857 /* Make this a fast path (no crref), since it's called so often. */
858 if (vcp->f.states & CStatd) {
860 if (*dp->d_name.name != '/' && vcp->mvstat == 2) /* root vnode */
861 check_bad_parent(dp); /* check and correct mvid */
864 #ifdef AFS_LINUX24_ENV
871 /* This avoids the crref when we don't have to do it. Watch for
872 * changes in afs_getattr that don't get replicated here!
874 if (vcp->f.states & CStatd &&
875 (!afs_fakestat_enable || vcp->mvstat != 1) &&
877 code = afs_CopyOutAttrs(vcp, &vattr);
880 code = afs_getattr(vcp, &vattr, credp);
884 afs_fill_inode(AFSTOV(vcp), &vattr);
887 #ifdef AFS_LINUX24_ENV
888 maybe_unlock_kernel();
891 return afs_convert_code(code);
894 /* Validate a dentry. Return 1 if unchanged, 0 if VFS layer should re-evaluate.
895 * In kernels 2.2.10 and above, we are passed an additional flags var which
896 * may have either the LOOKUP_FOLLOW OR LOOKUP_DIRECTORY set in which case
897 * we are advised to follow the entry if it is a link or to make sure that
898 * it is a directory. But since the kernel itself checks these possibilities
899 * later on, we shouldn't have to do it until later. Perhaps in the future..
902 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,10)
903 #ifdef DOP_REVALIDATE_TAKES_NAMEIDATA
904 afs_linux_dentry_revalidate(struct dentry *dp, struct nameidata *nd)
906 afs_linux_dentry_revalidate(struct dentry *dp, int flags)
909 afs_linux_dentry_revalidate(struct dentry *dp)
913 cred_t *credp = NULL;
914 struct vcache *vcp, *pvcp, *tvc = NULL;
916 struct afs_fakestat_state fakestate;
918 #ifdef AFS_LINUX24_ENV
922 afs_InitFakeStat(&fakestate);
926 vcp = VTOAFS(dp->d_inode);
927 pvcp = VTOAFS(dp->d_parent->d_inode); /* dget_parent()? */
929 if (vcp == afs_globalVp)
932 if (vcp->mvstat == 1) { /* mount point */
933 if (vcp->mvid && (vcp->f.states & CMValid)) {
936 struct vrequest treq;
939 code = afs_InitReq(&treq, credp);
941 #ifdef AFS_DARWIN_ENV
942 (strcmp(dp->d_name.name, ".DS_Store") == 0) ||
943 (strcmp(dp->d_name.name, "Contents") == 0) ||
945 (strcmp(dp->d_name.name, ".directory") == 0)) {
949 code = afs_TryEvalFakeStat(&vcp, &fakestate, &treq);
951 code = afs_EvalFakeStat(&vcp, &fakestate, &treq);
952 if ((tryEvalOnly && vcp->mvstat == 1) || code) {
953 /* a mount point, not yet replaced by its directory */
958 if (*dp->d_name.name != '/' && vcp->mvstat == 2) /* root vnode */
959 check_bad_parent(dp); /* check and correct mvid */
962 /* If the last looker changes, we should make sure the current
963 * looker still has permission to examine this file. This would
964 * always require a crref() which would be "slow".
966 if (vcp->last_looker != treq.uid) {
967 if (!afs_AccessOK(vcp, (vType(vcp) == VREG) ? PRSFS_READ : PRSFS_LOOKUP, &treq, CHECK_MODE_BITS))
970 vcp->last_looker = treq.uid;
974 /* If the parent's DataVersion has changed or the vnode
975 * is longer valid, we need to do a full lookup. VerifyVCache
976 * isn't enough since the vnode may have been renamed.
979 if (hgetlo(pvcp->f.m.DataVersion) > dp->d_time || !(vcp->f.states & CStatd)) {
982 afs_lookup(pvcp, (char *)dp->d_name.name, &tvc, credp);
983 if (!tvc || tvc != vcp)
986 if (afs_getattr(vcp, &vattr, credp))
989 vattr2inode(AFSTOV(vcp), &vattr);
990 dp->d_time = hgetlo(pvcp->f.m.DataVersion);
993 /* should we always update the attributes at this point? */
994 /* unlikely--the vcache entry hasn't changed */
998 pvcp = VTOAFS(dp->d_parent->d_inode); /* dget_parent()? */
999 if (hgetlo(pvcp->f.m.DataVersion) > dp->d_time)
1003 /* No change in parent's DataVersion so this negative
1004 * lookup is still valid. BUT, if a server is down a
1005 * negative lookup can result so there should be a
1006 * liftime as well. For now, always expire.
1019 afs_PutFakeStat(&fakestate);
1025 shrink_dcache_parent(dp);
1028 #ifdef AFS_LINUX24_ENV
1029 maybe_unlock_kernel();
1034 if (have_submounts(dp))
1042 afs_dentry_iput(struct dentry *dp, struct inode *ip)
1044 struct vcache *vcp = VTOAFS(ip);
1047 if (!AFS_IS_DISCONNECTED || (vcp->f.states & CUnlinked)) {
1048 (void) afs_InactiveVCache(vcp, NULL);
1051 #ifdef DCACHE_NFSFS_RENAMED
1052 dp->d_flags &= ~DCACHE_NFSFS_RENAMED;
1059 afs_dentry_delete(struct dentry *dp)
1061 if (dp->d_inode && (VTOAFS(dp->d_inode)->f.states & CUnlinked))
1062 return 1; /* bad inode? */
1067 struct dentry_operations afs_dentry_operations = {
1068 .d_revalidate = afs_linux_dentry_revalidate,
1069 .d_delete = afs_dentry_delete,
1070 .d_iput = afs_dentry_iput,
1073 /**********************************************************************
1074 * AFS Linux inode operations
1075 **********************************************************************/
1079 * Merely need to set enough of vattr to get us through the create. Note
1080 * that the higher level code (open_namei) will take care of any tuncation
1081 * explicitly. Exclusive open is also taken care of in open_namei.
1083 * name is in kernel space at this point.
1086 #ifdef IOP_CREATE_TAKES_NAMEIDATA
1087 afs_linux_create(struct inode *dip, struct dentry *dp, int mode,
1088 struct nameidata *nd)
1090 afs_linux_create(struct inode *dip, struct dentry *dp, int mode)
1094 cred_t *credp = crref();
1095 const char *name = dp->d_name.name;
1100 vattr.va_mode = mode;
1101 vattr.va_type = mode & S_IFMT;
1104 code = afs_create(VTOAFS(dip), (char *)name, &vattr, NONEXCL, mode,
1108 struct inode *ip = AFSTOV(vcp);
1110 afs_getattr(vcp, &vattr, credp);
1111 afs_fill_inode(ip, &vattr);
1112 insert_inode_hash(ip);
1113 dp->d_op = &afs_dentry_operations;
1114 dp->d_time = hgetlo(VTOAFS(dip)->f.m.DataVersion);
1115 d_instantiate(dp, ip);
1120 return afs_convert_code(code);
1123 /* afs_linux_lookup */
1124 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,10)
1125 static struct dentry *
1126 #ifdef IOP_LOOKUP_TAKES_NAMEIDATA
1127 afs_linux_lookup(struct inode *dip, struct dentry *dp,
1128 struct nameidata *nd)
1130 afs_linux_lookup(struct inode *dip, struct dentry *dp)
1134 afs_linux_lookup(struct inode *dip, struct dentry *dp)
1137 cred_t *credp = crref();
1138 struct vcache *vcp = NULL;
1139 const char *comp = dp->d_name.name;
1140 struct inode *ip = NULL;
1144 code = afs_lookup(VTOAFS(dip), (char *)comp, &vcp, credp);
1150 afs_getattr(vcp, &vattr, credp);
1151 afs_fill_inode(ip, &vattr);
1153 #ifdef HAVE_KERNEL_HLIST_UNHASHED
1154 hlist_unhashed(&ip->i_hash)
1156 ip->i_hash.prev == NULL
1159 insert_inode_hash(ip);
1161 dp->d_op = &afs_dentry_operations;
1162 dp->d_time = hgetlo(VTOAFS(dip)->f.m.DataVersion);
1165 #if defined(AFS_LINUX24_ENV)
1166 if (ip && S_ISDIR(ip->i_mode)) {
1167 struct dentry *alias;
1169 /* Try to invalidate an existing alias in favor of our new one */
1170 alias = d_find_alias(ip);
1172 if (d_invalidate(alias) == 0) {
1186 /* It's ok for the file to not be found. That's noted by the caller by
1187 * seeing that the dp->d_inode field is NULL.
1189 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,10)
1193 return ERR_PTR(afs_convert_code(code));
1197 return afs_convert_code(code);
1202 afs_linux_link(struct dentry *olddp, struct inode *dip, struct dentry *newdp)
1205 cred_t *credp = crref();
1206 const char *name = newdp->d_name.name;
1207 struct inode *oldip = olddp->d_inode;
1209 /* If afs_link returned the vnode, we could instantiate the
1210 * dentry. Since it's not, we drop this one and do a new lookup.
1215 code = afs_link(VTOAFS(oldip), VTOAFS(dip), (char *)name, credp);
1219 return afs_convert_code(code);
1223 afs_linux_unlink(struct inode *dip, struct dentry *dp)
1226 cred_t *credp = crref();
1227 const char *name = dp->d_name.name;
1228 struct vcache *tvc = VTOAFS(dp->d_inode);
1230 if (VREFCOUNT(tvc) > 1 && tvc->opens > 0
1231 && !(tvc->f.states & CUnlinked)) {
1232 struct dentry *__dp;
1242 osi_FreeSmallSpace(__name);
1243 __name = afs_newname();
1246 __dp = lookup_one_len(__name, dp->d_parent, strlen(__name));
1250 } while (__dp->d_inode != NULL);
1253 code = afs_rename(VTOAFS(dip), (char *)dp->d_name.name, VTOAFS(dip), (char *)__dp->d_name.name, credp);
1255 tvc->mvid = (void *) __name;
1258 crfree(tvc->uncred);
1260 tvc->uncred = credp;
1261 tvc->f.states |= CUnlinked;
1262 #ifdef DCACHE_NFSFS_RENAMED
1263 dp->d_flags |= DCACHE_NFSFS_RENAMED;
1266 osi_FreeSmallSpace(__name);
1271 __dp->d_time = hgetlo(VTOAFS(dip)->f.m.DataVersion);
1280 code = afs_remove(VTOAFS(dip), (char *)name, credp);
1286 return afs_convert_code(code);
1291 afs_linux_symlink(struct inode *dip, struct dentry *dp, const char *target)
1294 cred_t *credp = crref();
1296 const char *name = dp->d_name.name;
1298 /* If afs_symlink returned the vnode, we could instantiate the
1299 * dentry. Since it's not, we drop this one and do a new lookup.
1305 code = afs_symlink(VTOAFS(dip), (char *)name, &vattr, (char *)target, credp);
1308 return afs_convert_code(code);
1312 afs_linux_mkdir(struct inode *dip, struct dentry *dp, int mode)
1315 cred_t *credp = crref();
1316 struct vcache *tvcp = NULL;
1318 const char *name = dp->d_name.name;
1321 vattr.va_mask = ATTR_MODE;
1322 vattr.va_mode = mode;
1324 code = afs_mkdir(VTOAFS(dip), (char *)name, &vattr, &tvcp, credp);
1327 struct inode *ip = AFSTOV(tvcp);
1329 afs_getattr(tvcp, &vattr, credp);
1330 afs_fill_inode(ip, &vattr);
1332 dp->d_op = &afs_dentry_operations;
1333 dp->d_time = hgetlo(VTOAFS(dip)->f.m.DataVersion);
1334 d_instantiate(dp, ip);
1339 return afs_convert_code(code);
1343 afs_linux_rmdir(struct inode *dip, struct dentry *dp)
1346 cred_t *credp = crref();
1347 const char *name = dp->d_name.name;
1349 /* locking kernel conflicts with glock? */
1352 code = afs_rmdir(VTOAFS(dip), (char *)name, credp);
1355 /* Linux likes to see ENOTEMPTY returned from an rmdir() syscall
1356 * that failed because a directory is not empty. So, we map
1357 * EEXIST to ENOTEMPTY on linux.
1359 if (code == EEXIST) {
1368 return afs_convert_code(code);
1373 afs_linux_rename(struct inode *oldip, struct dentry *olddp,
1374 struct inode *newip, struct dentry *newdp)
1377 cred_t *credp = crref();
1378 const char *oldname = olddp->d_name.name;
1379 const char *newname = newdp->d_name.name;
1380 struct dentry *rehash = NULL;
1382 if (!list_empty(&newdp->d_hash)) {
1387 #if defined(AFS_LINUX24_ENV)
1388 if (atomic_read(&olddp->d_count) > 1)
1389 shrink_dcache_parent(olddp);
1393 code = afs_rename(VTOAFS(oldip), (char *)oldname, VTOAFS(newip), (char *)newname, credp);
1397 olddp->d_time = 0; /* force to revalidate */
1403 return afs_convert_code(code);
1407 /* afs_linux_ireadlink
1408 * Internal readlink which can return link contents to user or kernel space.
1409 * Note that the buffer is NOT supposed to be null-terminated.
1412 afs_linux_ireadlink(struct inode *ip, char *target, int maxlen, uio_seg_t seg)
1415 cred_t *credp = crref();
1419 setup_uio(&tuio, &iov, target, (afs_offs_t) 0, maxlen, UIO_READ, seg);
1420 code = afs_readlink(VTOAFS(ip), &tuio, credp);
1424 return maxlen - tuio.uio_resid;
1426 return afs_convert_code(code);
1429 #if !defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE)
1430 /* afs_linux_readlink
1431 * Fill target (which is in user space) with contents of symlink.
1434 afs_linux_readlink(struct dentry *dp, char *target, int maxlen)
1437 struct inode *ip = dp->d_inode;
1440 code = afs_linux_ireadlink(ip, target, maxlen, AFS_UIOUSER);
1446 /* afs_linux_follow_link
1447 * a file system dependent link following routine.
1449 #if defined(AFS_LINUX24_ENV)
1450 static int afs_linux_follow_link(struct dentry *dentry, struct nameidata *nd)
1455 name = osi_Alloc(PATH_MAX);
1461 code = afs_linux_ireadlink(dentry->d_inode, name, PATH_MAX - 1, AFS_UIOSYS);
1469 code = vfs_follow_link(nd, name);
1472 osi_Free(name, PATH_MAX);
1477 #else /* !defined(AFS_LINUX24_ENV) */
1479 static struct dentry *
1480 afs_linux_follow_link(struct dentry *dp, struct dentry *basep,
1481 unsigned int follow)
1489 name = osi_Alloc(PATH_MAX + 1);
1493 return ERR_PTR(-EIO);
1496 code = afs_linux_ireadlink(dp->d_inode, name, PATH_MAX, AFS_UIOSYS);
1501 if (code < -MAX_ERRNO)
1502 res = ERR_PTR(-EIO);
1504 res = ERR_PTR(code);
1507 res = lookup_dentry(name, basep, follow);
1511 osi_Free(name, PATH_MAX + 1);
1515 #endif /* AFS_LINUX24_ENV */
1516 #endif /* USABLE_KERNEL_PAGE_SYMLINK_CACHE */
1518 #if defined(AFS_CACHE_BYPASS)
1520 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
1523 afs_linux_can_bypass(struct inode *ip) {
1524 switch(cache_bypass_strategy) {
1525 case NEVER_BYPASS_CACHE:
1527 case ALWAYS_BYPASS_CACHE:
1529 case LARGE_FILES_BYPASS_CACHE:
1530 if(i_size_read(ip) > cache_bypass_threshold)
1538 afs_linux_cache_bypass_read(struct file *fp, struct address_space *mapping,
1539 struct list_head *page_list, unsigned num_pages)
1544 struct iovec* iovecp;
1545 struct nocache_read_request *ancr;
1546 struct page *pp, *ppt;
1547 struct pagevec lrupv;
1551 struct inode *ip = FILE_INODE(fp);
1552 struct vcache *avc = VTOAFS(ip);
1553 afs_int32 bypasscache = 0; /* bypass for this read */
1554 afs_int32 base_index = 0;
1555 afs_int32 page_count = 0;
1558 /* background thread must free: iovecp, auio, ancr */
1559 iovecp = osi_Alloc(num_pages * sizeof(struct iovec));
1561 auio = osi_Alloc(sizeof(uio_t));
1562 auio->uio_iov = iovecp;
1563 auio->uio_iovcnt = num_pages;
1564 auio->uio_flag = UIO_READ;
1565 auio->uio_seg = AFS_UIOSYS;
1566 auio->uio_resid = num_pages * PAGE_SIZE;
1568 ancr = osi_Alloc(sizeof(struct nocache_read_request));
1570 ancr->offset = auio->uio_offset;
1571 ancr->length = auio->uio_resid;
1573 pagevec_init(&lrupv, 0);
1575 for(page_ix = 0; page_ix < num_pages; ++page_ix) {
1577 if(list_empty(page_list))
1580 pp = list_entry(page_list->prev, struct page, lru);
1581 /* If we allocate a page and don't remove it from page_list,
1582 * the page cache gets upset. */
1584 isize = (i_size_read(fp->f_mapping->host) - 1) >> PAGE_CACHE_SHIFT;
1585 if(pp->index > isize) {
1592 offset = ((loff_t) pp->index) << PAGE_CACHE_SHIFT;
1593 auio->uio_offset = offset;
1594 base_index = pp->index;
1596 iovecp[page_ix].iov_len = PAGE_SIZE;
1597 code = add_to_page_cache(pp, mapping, pp->index, GFP_KERNEL);
1598 if(base_index != pp->index) {
1601 page_cache_release(pp);
1602 iovecp[page_ix].iov_base = (void *) 0;
1610 page_cache_release(pp);
1611 iovecp[page_ix].iov_base = (void *) 0;
1614 if(!PageLocked(pp)) {
1618 /* save the page for background map */
1619 iovecp[page_ix].iov_base = (void*) pp;
1621 /* and put it on the LRU cache */
1622 if (!pagevec_add(&lrupv, pp))
1623 __pagevec_lru_add(&lrupv);
1627 /* If there were useful pages in the page list, make sure all pages
1628 * are in the LRU cache, then schedule the read */
1630 pagevec_lru_add(&lrupv);
1632 code = afs_ReadNoCache(avc, ancr, credp);
1635 /* If there is nothing for the background thread to handle,
1636 * it won't be freeing the things that we never gave it */
1637 osi_Free(iovecp, num_pages * sizeof(struct iovec));
1638 osi_Free(auio, sizeof(uio_t));
1639 osi_Free(ancr, sizeof(struct nocache_read_request));
1641 /* we do not flush, release, or unmap pages--that will be
1642 * done for us by the background thread as each page comes in
1643 * from the fileserver */
1645 return afs_convert_code(code);
1648 #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0) */
1649 #endif /* defined(AFS_CACHE_BYPASS */
1652 afs_linux_read_cache(struct file *cachefp, struct page *page,
1653 int chunk, struct pagevec *lrupv,
1654 struct afs_pagecopy_task *task) {
1655 loff_t offset = page_offset(page);
1656 struct page *newpage, *cachepage;
1657 struct address_space *cachemapping;
1661 cachemapping = cachefp->f_dentry->d_inode->i_mapping;
1665 /* From our offset, we now need to work out which page in the disk
1666 * file it corresponds to. This will be fun ... */
1667 pageindex = (offset - AFS_CHUNKTOBASE(chunk)) >> PAGE_CACHE_SHIFT;
1669 while (cachepage == NULL) {
1670 cachepage = find_get_page(cachemapping, pageindex);
1673 newpage = page_cache_alloc_cold(cachemapping);
1679 code = add_to_page_cache(newpage, cachemapping,
1680 pageindex, GFP_KERNEL);
1682 cachepage = newpage;
1685 page_cache_get(cachepage);
1686 if (!pagevec_add(lrupv, cachepage))
1687 __pagevec_lru_add_file(lrupv);
1690 page_cache_release(newpage);
1692 if (code != -EEXIST)
1696 lock_page(cachepage);
1700 if (!PageUptodate(cachepage)) {
1701 ClearPageError(cachepage);
1702 code = cachemapping->a_ops->readpage(NULL, cachepage);
1703 if (!code && !task) {
1704 wait_on_page_locked(cachepage);
1707 unlock_page(cachepage);
1711 if (PageUptodate(cachepage)) {
1712 copy_highpage(page, cachepage);
1713 flush_dcache_page(page);
1714 SetPageUptodate(page);
1717 afs_pagecopy_queue_page(task, cachepage, page);
1729 page_cache_release(cachepage);
1735 afs_linux_readpage_fastpath(struct file *fp, struct page *pp, int *codep)
1737 loff_t offset = page_offset(pp);
1738 struct inode *ip = FILE_INODE(fp);
1739 struct vcache *avc = VTOAFS(ip);
1741 struct file *cacheFp = NULL;
1744 struct pagevec lrupv;
1746 /* Not a UFS cache, don't do anything */
1747 if (cacheDiskType != AFS_FCACHE_TYPE_UFS)
1750 /* Can't do anything if the vcache isn't statd , or if the read
1751 * crosses a chunk boundary.
1753 if (!(avc->f.states & CStatd) ||
1754 AFS_CHUNK(offset) != AFS_CHUNK(offset + PAGE_SIZE)) {
1758 ObtainWriteLock(&avc->lock, 911);
1760 /* XXX - See if hinting actually makes things faster !!! */
1762 /* See if we have a suitable entry already cached */
1766 /* We need to lock xdcache, then dcache, to handle situations where
1767 * the hint is on the free list. However, we can't safely do this
1768 * according to the locking hierarchy. So, use a non blocking lock.
1770 ObtainReadLock(&afs_xdcache);
1771 dcLocked = ( 0 == NBObtainReadLock(&tdc->lock));
1773 if (dcLocked && (tdc->index != NULLIDX)
1774 && !FidCmp(&tdc->f.fid, &avc->f.fid)
1775 && tdc->f.chunk == AFS_CHUNK(offset)
1776 && !(afs_indexFlags[tdc->index] & (IFFree | IFDiscarded))) {
1777 /* Bonus - the hint was correct */
1780 /* Only destroy the hint if its actually invalid, not if there's
1781 * just been a locking failure */
1783 ReleaseReadLock(&tdc->lock);
1790 ReleaseReadLock(&afs_xdcache);
1793 /* No hint, or hint is no longer valid - see if we can get something
1794 * directly from the dcache
1797 tdc = afs_FindDCache(avc, offset);
1800 ReleaseWriteLock(&avc->lock);
1805 ObtainReadLock(&tdc->lock);
1807 /* Is the dcache we've been given currently up to date */
1808 if (!hsame(avc->f.m.DataVersion, tdc->f.versionNo) ||
1809 (tdc->dflags & DFFetching)) {
1810 ReleaseWriteLock(&avc->lock);
1811 ReleaseReadLock(&tdc->lock);
1816 /* Update our hint for future abuse */
1819 /* Okay, so we've now got a cache file that is up to date */
1821 /* XXX - I suspect we should be locking the inodes before we use them! */
1823 cacheFp = afs_linux_raw_open(&tdc->f.inode, NULL);
1824 pagevec_init(&lrupv, 0);
1826 code = afs_linux_read_cache(cacheFp, pp, tdc->f.chunk, &lrupv, NULL);
1828 if (pagevec_count(&lrupv))
1829 __pagevec_lru_add_file(&lrupv);
1831 filp_close(cacheFp, NULL);
1834 ReleaseReadLock(&tdc->lock);
1835 ReleaseWriteLock(&avc->lock);
1842 /* afs_linux_readpage
1843 * all reads come through here. A strategy-like read call.
1846 afs_linux_readpage(struct file *fp, struct page *pp)
1849 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
1851 afs_offs_t offset = ((loff_t) pp->index) << PAGE_CACHE_SHIFT;
1853 ulong address = afs_linux_page_address(pp);
1854 afs_offs_t offset = pageoff(pp);
1856 #if defined(AFS_CACHE_BYPASS)
1857 afs_int32 bypasscache = 0; /* bypass for this read */
1858 struct nocache_read_request *ancr;
1859 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
1864 struct iovec *iovecp;
1865 struct inode *ip = FILE_INODE(fp);
1866 afs_int32 cnt = page_count(pp);
1867 struct vcache *avc = VTOAFS(ip);
1870 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
1872 if (afs_linux_readpage_fastpath(fp, pp, &code)) {
1880 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
1884 atomic_add(1, &pp->count);
1885 set_bit(PG_locked, &pp->flags); /* other bits? See mm.h */
1886 clear_bit(PG_error, &pp->flags);
1888 #if defined(AFS_CACHE_BYPASS)
1889 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
1890 /* If the page is past the end of the file, skip it */
1891 isize = (i_size_read(fp->f_mapping->host) - 1) >> PAGE_CACHE_SHIFT;
1892 if(pp->index > isize) {
1899 /* if bypasscache, receiver frees, else we do */
1900 auio = osi_Alloc(sizeof(uio_t));
1901 iovecp = osi_Alloc(sizeof(struct iovec));
1903 setup_uio(auio, iovecp, (char *)address, offset, PAGE_SIZE, UIO_READ,
1906 #if defined(AFS_CACHE_BYPASS)
1907 bypasscache = afs_linux_can_bypass(ip);
1909 /* In the new incarnation of selective caching, a file's caching policy
1910 * can change, eg because file size exceeds threshold, etc. */
1911 trydo_cache_transition(avc, credp, bypasscache);
1916 /* save the page for background map */
1917 auio->uio_iov->iov_base = (void*) pp;
1918 /* the background thread will free this */
1919 ancr = osi_Alloc(sizeof(struct nocache_read_request));
1921 ancr->offset = offset;
1922 ancr->length = PAGE_SIZE;
1924 maybe_lock_kernel();
1925 code = afs_ReadNoCache(avc, ancr, credp);
1926 maybe_unlock_kernel();
1928 goto done; /* skips release page, doing it in bg thread */
1932 #ifdef AFS_LINUX24_ENV
1933 maybe_lock_kernel();
1937 afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE, ICL_TYPE_POINTER, ip,
1938 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, cnt, ICL_TYPE_INT32,
1939 99999); /* not a possible code value */
1941 code = afs_rdwr(avc, auio, UIO_READ, 0, credp);
1943 afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE, ICL_TYPE_POINTER, ip,
1944 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, cnt, ICL_TYPE_INT32,
1946 AFS_DISCON_UNLOCK();
1948 #ifdef AFS_LINUX24_ENV
1949 maybe_unlock_kernel();
1952 /* XXX valid for no-cache also? Check last bits of files... :)
1953 * Cognate code goes in afs_NoCacheFetchProc. */
1954 if (auio->uio_resid) /* zero remainder of page */
1955 memset((void *)(address + (PAGE_SIZE - auio->uio_resid)), 0,
1958 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
1959 flush_dcache_page(pp);
1960 SetPageUptodate(pp);
1962 set_bit(PG_uptodate, &pp->flags);
1966 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
1970 clear_bit(PG_locked, &pp->flags);
1975 #if defined(AFS_CACHE_BYPASS)
1976 /* do not call afs_GetDCache if cache is bypassed */
1981 /* free if not bypassing cache */
1982 osi_Free(auio, sizeof(uio_t));
1983 osi_Free(iovecp, sizeof(struct iovec));
1985 if (!code && AFS_CHUNKOFFSET(offset) == 0) {
1987 struct vrequest treq;
1990 code = afs_InitReq(&treq, credp);
1991 if (!code && !NBObtainWriteLock(&avc->lock, 534)) {
1992 tdc = afs_FindDCache(avc, offset);
1994 if (!(tdc->mflags & DFNextStarted))
1995 afs_PrefetchChunk(avc, tdc, credp, &treq);
1998 ReleaseWriteLock(&avc->lock);
2003 #if defined(AFS_CACHE_BYPASS)
2007 return afs_convert_code(code);
2010 /* Readpages reads a number of pages for a particular file. We use
2011 * this to optimise the reading, by limiting the number of times upon which
2012 * we have to lookup, lock and open vcaches and dcaches
2016 afs_linux_readpages(struct file *fp, struct address_space *mapping,
2017 struct list_head *page_list, unsigned int num_pages)
2019 struct inode *inode = mapping->host;
2020 struct vcache *avc = VTOAFS(inode);
2022 struct file *cacheFp = NULL;
2024 unsigned int page_idx;
2026 struct pagevec lrupv;
2027 struct afs_pagecopy_task *task;
2029 #if defined(AFS_CACHE_BYPASS)
2030 bypasscache = afs_linux_can_bypass(ip);
2032 /* In the new incarnation of selective caching, a file's caching policy
2033 * can change, eg because file size exceeds threshold, etc. */
2034 trydo_cache_transition(avc, credp, bypasscache);
2037 return afs_linux_cache_bypass_read(ip, mapping, page_list, num_pages);
2041 if ((code = afs_linux_VerifyVCache(avc, NULL))) {
2046 ObtainWriteLock(&avc->lock, 912);
2049 task = afs_pagecopy_init_task();
2052 pagevec_init(&lrupv, 0);
2053 for (page_idx = 0; page_idx < num_pages; page_idx++) {
2054 struct page *page = list_entry(page_list->prev, struct page, lru);
2055 list_del(&page->lru);
2056 offset = page_offset(page);
2058 if (tdc && tdc->f.chunk != AFS_CHUNK(offset)) {
2060 ReleaseReadLock(&tdc->lock);
2065 filp_close(cacheFp, NULL);
2070 if ((tdc = afs_FindDCache(avc, offset))) {
2071 ObtainReadLock(&tdc->lock);
2072 if (!hsame(avc->f.m.DataVersion, tdc->f.versionNo) ||
2073 (tdc->dflags & DFFetching)) {
2074 ReleaseReadLock(&tdc->lock);
2081 cacheFp = afs_linux_raw_open(&tdc->f.inode, NULL);
2084 if (tdc && !add_to_page_cache(page, mapping, page->index,
2086 page_cache_get(page);
2087 if (!pagevec_add(&lrupv, page))
2088 __pagevec_lru_add_file(&lrupv);
2090 afs_linux_read_cache(cacheFp, page, tdc->f.chunk, &lrupv, task);
2092 page_cache_release(page);
2094 if (pagevec_count(&lrupv))
2095 __pagevec_lru_add_file(&lrupv);
2098 filp_close(cacheFp, NULL);
2100 afs_pagecopy_put_task(task);
2104 ReleaseReadLock(&tdc->lock);
2108 ReleaseWriteLock(&avc->lock);
2113 #if defined(AFS_LINUX24_ENV)
2115 afs_linux_writepage_sync(struct inode *ip, struct page *pp,
2116 unsigned long offset, unsigned int count)
2118 struct vcache *vcp = VTOAFS(ip);
2127 buffer = kmap(pp) + offset;
2128 base = (((loff_t) pp->index) << PAGE_CACHE_SHIFT) + offset;
2131 maybe_lock_kernel();
2133 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
2134 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, page_count(pp),
2135 ICL_TYPE_INT32, 99999);
2137 ObtainWriteLock(&vcp->lock, 532);
2138 if (vcp->f.states & CPageWrite) {
2139 ReleaseWriteLock(&vcp->lock);
2141 maybe_unlock_kernel();
2144 /* should mark it dirty? */
2147 vcp->f.states |= CPageWrite;
2148 ReleaseWriteLock(&vcp->lock);
2150 setup_uio(&tuio, &iovec, buffer, base, count, UIO_WRITE, AFS_UIOSYS);
2152 code = afs_write(vcp, &tuio, f_flags, credp, 0);
2154 i_size_write(ip, vcp->f.m.Length);
2155 ip->i_blocks = ((vcp->f.m.Length + 1023) >> 10) << 1;
2157 ObtainWriteLock(&vcp->lock, 533);
2159 struct vrequest treq;
2161 if (!afs_InitReq(&treq, credp))
2162 code = afs_DoPartialWrite(vcp, &treq);
2164 code = code ? afs_convert_code(code) : count - tuio.uio_resid;
2166 vcp->f.states &= ~CPageWrite;
2167 ReleaseWriteLock(&vcp->lock);
2169 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
2170 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, page_count(pp),
2171 ICL_TYPE_INT32, code);
2174 maybe_unlock_kernel();
2183 #ifdef AOP_WRITEPAGE_TAKES_WRITEBACK_CONTROL
2184 afs_linux_writepage(struct page *pp, struct writeback_control *wbc)
2186 afs_linux_writepage(struct page *pp)
2189 struct address_space *mapping = pp->mapping;
2190 struct inode *inode;
2191 unsigned long end_index;
2192 unsigned offset = PAGE_CACHE_SIZE;
2195 if (PageLaunder(pp)) {
2196 return(fail_writepage(pp));
2199 inode = (struct inode *)mapping->host;
2200 end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
2203 if (pp->index < end_index)
2205 /* things got complicated... */
2206 offset = i_size_read(inode) & (PAGE_CACHE_SIZE - 1);
2207 /* OK, are we completely out? */
2208 if (pp->index >= end_index + 1 || !offset)
2211 status = afs_linux_writepage_sync(inode, pp, 0, offset);
2212 SetPageUptodate(pp);
2214 if (status == offset)
2220 /* afs_linux_updatepage
2221 * What one would have thought was writepage - write dirty page to file.
2222 * Called from generic_file_write. buffer is still in user space. pagep
2223 * has been filled in with old data if we're updating less than a page.
2226 afs_linux_updatepage(struct file *fp, struct page *pp, unsigned long offset,
2227 unsigned int count, int sync)
2229 struct vcache *vcp = VTOAFS(FILE_INODE(fp));
2230 u8 *page_addr = (u8 *) afs_linux_page_address(pp);
2236 set_bit(PG_locked, &pp->flags);
2241 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
2242 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, page_count(pp),
2243 ICL_TYPE_INT32, 99999);
2244 setup_uio(&tuio, &iovec, page_addr + offset,
2245 (afs_offs_t) (pageoff(pp) + offset), count, UIO_WRITE,
2248 code = afs_write(vcp, &tuio, fp->f_flags, credp, 0);
2250 i_size_write(ip, vcp->f.m.Length);
2251 ip->i_blocks = ((vcp->f.m.Length + 1023) >> 10) << 1;
2254 struct vrequest treq;
2256 ObtainWriteLock(&vcp->lock, 533);
2257 vcp->f.m.Date = osi_Time(); /* set modification time */
2258 if (!afs_InitReq(&treq, credp))
2259 code = afs_DoPartialWrite(vcp, &treq);
2260 ReleaseWriteLock(&vcp->lock);
2263 code = code ? afs_convert_code(code) : count - tuio.uio_resid;
2264 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
2265 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, page_count(pp),
2266 ICL_TYPE_INT32, code);
2268 AFS_DISCON_UNLOCK();
2272 clear_bit(PG_locked, &pp->flags);
2277 /* afs_linux_permission
2278 * Check access rights - returns error if can't check or permission denied.
2281 #ifdef IOP_PERMISSION_TAKES_NAMEIDATA
2282 afs_linux_permission(struct inode *ip, int mode, struct nameidata *nd)
2284 afs_linux_permission(struct inode *ip, int mode)
2288 cred_t *credp = crref();
2292 if (mode & MAY_EXEC)
2294 if (mode & MAY_READ)
2296 if (mode & MAY_WRITE)
2298 code = afs_access(VTOAFS(ip), tmp, credp);
2302 return afs_convert_code(code);
2305 #if defined(AFS_LINUX24_ENV) && !defined(HAVE_WRITE_BEGIN)
2307 afs_linux_commit_write(struct file *file, struct page *page, unsigned offset,
2312 code = afs_linux_writepage_sync(file->f_dentry->d_inode, page,
2313 offset, to - offset);
2320 afs_linux_prepare_write(struct file *file, struct page *page, unsigned from,
2323 /* sometime between 2.4.0 and 2.4.19, the callers of prepare_write began to
2324 call kmap directly instead of relying on us to do it */
2330 #if defined(HAVE_WRITE_BEGIN)
2332 afs_linux_write_end(struct file *file, struct address_space *mapping,
2333 loff_t pos, unsigned len, unsigned copied,
2334 struct page *page, void *fsdata)
2337 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
2339 code = afs_linux_writepage_sync(file->f_dentry->d_inode, page,
2342 page_cache_release(page);
2347 afs_linux_write_begin(struct file *file, struct address_space *mapping,
2348 loff_t pos, unsigned len, unsigned flags,
2349 struct page **pagep, void **fsdata)
2352 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
2353 #if defined(HAVE_GRAB_CACHE_PAGE_WRITE_BEGIN)
2354 page = grab_cache_page_write_begin(mapping, index, flags);
2356 page = __grab_cache_page(mapping, index);
2365 static struct inode_operations afs_file_iops = {
2366 #if defined(AFS_LINUX24_ENV)
2367 .permission = afs_linux_permission,
2368 .revalidate = afs_linux_revalidate,
2369 .setattr = afs_notify_change,
2371 .default_file_ops = &afs_file_fops,
2372 .readpage = afs_linux_readpage,
2373 .revalidate = afs_linux_revalidate,
2374 .updatepage = afs_linux_updatepage,
2378 #if defined(AFS_LINUX24_ENV)
2379 static struct address_space_operations afs_file_aops = {
2380 .readpage = afs_linux_readpage,
2381 .readpages = afs_linux_readpages,
2382 .writepage = afs_linux_writepage,
2383 #if defined (HAVE_WRITE_BEGIN)
2384 .write_begin = afs_linux_write_begin,
2385 .write_end = afs_linux_write_end,
2387 .commit_write = afs_linux_commit_write,
2388 .prepare_write = afs_linux_prepare_write,
2394 /* Separate ops vector for directories. Linux 2.2 tests type of inode
2395 * by what sort of operation is allowed.....
2398 static struct inode_operations afs_dir_iops = {
2399 #if !defined(AFS_LINUX24_ENV)
2400 .default_file_ops = &afs_dir_fops,
2402 .setattr = afs_notify_change,
2404 .create = afs_linux_create,
2405 .lookup = afs_linux_lookup,
2406 .link = afs_linux_link,
2407 .unlink = afs_linux_unlink,
2408 .symlink = afs_linux_symlink,
2409 .mkdir = afs_linux_mkdir,
2410 .rmdir = afs_linux_rmdir,
2411 .rename = afs_linux_rename,
2412 .revalidate = afs_linux_revalidate,
2413 .permission = afs_linux_permission,
2416 /* We really need a separate symlink set of ops, since do_follow_link()
2417 * determines if it _is_ a link by checking if the follow_link op is set.
2419 #if defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE)
2421 afs_symlink_filler(struct file *file, struct page *page)
2423 struct inode *ip = (struct inode *)page->mapping->host;
2424 char *p = (char *)kmap(page);
2427 maybe_lock_kernel();
2429 code = afs_linux_ireadlink(ip, p, PAGE_SIZE, AFS_UIOSYS);
2434 p[code] = '\0'; /* null terminate? */
2435 maybe_unlock_kernel();
2437 SetPageUptodate(page);
2443 maybe_unlock_kernel();
2451 static struct address_space_operations afs_symlink_aops = {
2452 .readpage = afs_symlink_filler
2454 #endif /* USABLE_KERNEL_PAGE_SYMLINK_CACHE */
2456 static struct inode_operations afs_symlink_iops = {
2457 #if defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE)
2458 .readlink = page_readlink,
2459 #if defined(HAVE_KERNEL_PAGE_FOLLOW_LINK)
2460 .follow_link = page_follow_link,
2462 .follow_link = page_follow_link_light,
2463 .put_link = page_put_link,
2465 #else /* !defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE) */
2466 .readlink = afs_linux_readlink,
2467 .follow_link = afs_linux_follow_link,
2468 #if !defined(AFS_LINUX24_ENV)
2469 .permission = afs_linux_permission,
2470 .revalidate = afs_linux_revalidate,
2472 #endif /* USABLE_KERNEL_PAGE_SYMLINK_CACHE */
2473 #if defined(AFS_LINUX24_ENV)
2474 .setattr = afs_notify_change,
2479 afs_fill_inode(struct inode *ip, struct vattr *vattr)
2483 vattr2inode(ip, vattr);
2485 /* Reset ops if symlink or directory. */
2486 if (S_ISREG(ip->i_mode)) {
2487 ip->i_op = &afs_file_iops;
2488 #if defined(AFS_LINUX24_ENV)
2489 ip->i_fop = &afs_file_fops;
2490 ip->i_data.a_ops = &afs_file_aops;
2493 } else if (S_ISDIR(ip->i_mode)) {
2494 ip->i_op = &afs_dir_iops;
2495 #if defined(AFS_LINUX24_ENV)
2496 ip->i_fop = &afs_dir_fops;
2499 } else if (S_ISLNK(ip->i_mode)) {
2500 ip->i_op = &afs_symlink_iops;
2501 #if defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE)
2502 ip->i_data.a_ops = &afs_symlink_aops;
2503 ip->i_mapping = &ip->i_data;