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 <linux/mm_inline.h>
32 #include <linux/pagemap.h>
33 #include <linux/writeback.h>
34 #include <linux/pagevec.h>
35 #include <linux/aio.h>
37 #include "afs/afs_bypasscache.h"
39 #include "osi_compat.h"
40 #include "osi_pagecopy.h"
42 #ifndef HAVE_LINUX_PAGEVEC_LRU_ADD_FILE
43 #define __pagevec_lru_add_file __pagevec_lru_add
47 #define MAX_ERRNO 1000L
50 int cachefs_noreadpage = 0;
52 extern struct backing_dev_info *afs_backing_dev_info;
54 extern struct vcache *afs_globalVp;
56 /* This function converts a positive error code from AFS into a negative
57 * code suitable for passing into the Linux VFS layer. It checks that the
58 * error code is within the permissable bounds for the ERR_PTR mechanism.
60 * _All_ error codes which come from the AFS layer should be passed through
61 * this function before being returned to the kernel.
65 afs_convert_code(int code) {
66 if ((code >= 0) && (code <= MAX_ERRNO))
72 /* Linux doesn't require a credp for many functions, and crref is an expensive
73 * operation. This helper function avoids obtaining it for VerifyVCache calls
77 afs_linux_VerifyVCache(struct vcache *avc, cred_t **retcred) {
79 struct vrequest *treq = NULL;
82 if (avc->f.states & CStatd) {
90 code = afs_CreateReq(&treq, credp);
92 code = afs_VerifyVCache2(avc, treq);
101 return afs_convert_code(code);
104 #if defined(STRUCT_FILE_OPERATIONS_HAS_READ_ITER) || defined(HAVE_LINUX_GENERIC_FILE_AIO_READ)
105 # if defined(STRUCT_FILE_OPERATIONS_HAS_READ_ITER)
107 afs_linux_read_iter(struct kiocb *iocb, struct iov_iter *iter)
108 # elif defined(LINUX_HAS_NONVECTOR_AIO)
110 afs_linux_aio_read(struct kiocb *iocb, char __user *buf, size_t bufsize,
114 afs_linux_aio_read(struct kiocb *iocb, const struct iovec *buf,
115 unsigned long bufsize, loff_t pos)
118 struct file *fp = iocb->ki_filp;
120 struct vcache *vcp = VTOAFS(fp->f_dentry->d_inode);
121 # if defined(STRUCT_FILE_OPERATIONS_HAS_READ_ITER)
122 loff_t pos = iocb->ki_pos;
123 unsigned long bufsize = iter->nr_segs;
128 afs_Trace4(afs_iclSetp, CM_TRACE_AIOREADOP, ICL_TYPE_POINTER, vcp,
129 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(pos), ICL_TYPE_INT32,
130 (afs_int32)bufsize, ICL_TYPE_INT32, 99999);
131 code = afs_linux_VerifyVCache(vcp, NULL);
134 /* Linux's FlushPages implementation doesn't ever use credp,
135 * so we optimise by not using it */
136 osi_FlushPages(vcp, NULL); /* ensure stale pages are gone */
138 # if defined(STRUCT_FILE_OPERATIONS_HAS_READ_ITER)
139 code = generic_file_read_iter(iocb, iter);
141 code = generic_file_aio_read(iocb, buf, bufsize, pos);
146 afs_Trace4(afs_iclSetp, CM_TRACE_AIOREADOP, ICL_TYPE_POINTER, vcp,
147 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(pos), ICL_TYPE_INT32,
148 (afs_int32)bufsize, ICL_TYPE_INT32, code);
154 afs_linux_read(struct file *fp, char *buf, size_t count, loff_t * offp)
157 struct vcache *vcp = VTOAFS(fp->f_dentry->d_inode);
160 afs_Trace4(afs_iclSetp, CM_TRACE_READOP, ICL_TYPE_POINTER, vcp,
161 ICL_TYPE_OFFSET, offp, ICL_TYPE_INT32, count, ICL_TYPE_INT32,
163 code = afs_linux_VerifyVCache(vcp, NULL);
166 /* Linux's FlushPages implementation doesn't ever use credp,
167 * so we optimise by not using it */
168 osi_FlushPages(vcp, NULL); /* ensure stale pages are gone */
170 code = do_sync_read(fp, buf, count, offp);
174 afs_Trace4(afs_iclSetp, CM_TRACE_READOP, ICL_TYPE_POINTER, vcp,
175 ICL_TYPE_OFFSET, offp, ICL_TYPE_INT32, count, ICL_TYPE_INT32,
183 /* Now we have integrated VM for writes as well as reads. the generic write operations
184 * also take care of re-positioning the pointer if file is open in append
185 * mode. Call fake open/close to ensure we do writes of core dumps.
187 #if defined(STRUCT_FILE_OPERATIONS_HAS_READ_ITER) || defined(HAVE_LINUX_GENERIC_FILE_AIO_READ)
188 # if defined(STRUCT_FILE_OPERATIONS_HAS_READ_ITER)
190 afs_linux_write_iter(struct kiocb *iocb, struct iov_iter *iter)
191 # elif defined(LINUX_HAS_NONVECTOR_AIO)
193 afs_linux_aio_write(struct kiocb *iocb, const char __user *buf, size_t bufsize,
197 afs_linux_aio_write(struct kiocb *iocb, const struct iovec *buf,
198 unsigned long bufsize, loff_t pos)
202 struct vcache *vcp = VTOAFS(iocb->ki_filp->f_dentry->d_inode);
204 # if defined(STRUCT_FILE_OPERATIONS_HAS_READ_ITER)
205 loff_t pos = iocb->ki_pos;
206 unsigned long bufsize = iter->nr_segs;
211 afs_Trace4(afs_iclSetp, CM_TRACE_AIOWRITEOP, ICL_TYPE_POINTER, vcp,
212 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(pos), ICL_TYPE_INT32,
213 (afs_int32)bufsize, ICL_TYPE_INT32,
214 (iocb->ki_filp->f_flags & O_APPEND) ? 99998 : 99999);
216 code = afs_linux_VerifyVCache(vcp, &credp);
218 ObtainWriteLock(&vcp->lock, 529);
220 ReleaseWriteLock(&vcp->lock);
223 # if defined(STRUCT_FILE_OPERATIONS_HAS_READ_ITER)
224 code = generic_file_write_iter(iocb, iter);
226 code = generic_file_aio_write(iocb, buf, bufsize, pos);
231 ObtainWriteLock(&vcp->lock, 530);
233 if (vcp->execsOrWriters == 1 && !credp)
236 afs_FakeClose(vcp, credp);
237 ReleaseWriteLock(&vcp->lock);
239 afs_Trace4(afs_iclSetp, CM_TRACE_AIOWRITEOP, ICL_TYPE_POINTER, vcp,
240 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(pos), ICL_TYPE_INT32,
241 (afs_int32)bufsize, ICL_TYPE_INT32, code);
250 afs_linux_write(struct file *fp, const char *buf, size_t count, loff_t * offp)
253 struct vcache *vcp = VTOAFS(fp->f_dentry->d_inode);
258 afs_Trace4(afs_iclSetp, CM_TRACE_WRITEOP, ICL_TYPE_POINTER, vcp,
259 ICL_TYPE_OFFSET, offp, ICL_TYPE_INT32, count, ICL_TYPE_INT32,
260 (fp->f_flags & O_APPEND) ? 99998 : 99999);
262 code = afs_linux_VerifyVCache(vcp, &credp);
264 ObtainWriteLock(&vcp->lock, 529);
266 ReleaseWriteLock(&vcp->lock);
269 code = do_sync_write(fp, buf, count, offp);
273 ObtainWriteLock(&vcp->lock, 530);
275 if (vcp->execsOrWriters == 1 && !credp)
278 afs_FakeClose(vcp, credp);
279 ReleaseWriteLock(&vcp->lock);
281 afs_Trace4(afs_iclSetp, CM_TRACE_WRITEOP, ICL_TYPE_POINTER, vcp,
282 ICL_TYPE_OFFSET, offp, ICL_TYPE_INT32, count, ICL_TYPE_INT32,
292 extern int BlobScan(struct dcache * afile, afs_int32 ablob, afs_int32 *ablobOut);
294 /* This is a complete rewrite of afs_readdir, since we can make use of
295 * filldir instead of afs_readdir_move. Note that changes to vcache/dcache
296 * handling and use of bulkstats will need to be reflected here as well.
299 #if defined(STRUCT_FILE_OPERATIONS_HAS_ITERATE)
300 afs_linux_readdir(struct file *fp, struct dir_context *ctx)
302 afs_linux_readdir(struct file *fp, void *dirbuf, filldir_t filldir)
305 struct vcache *avc = VTOAFS(FILE_INODE(fp));
306 struct vrequest *treq = NULL;
312 struct DirBuffer entry;
315 afs_size_t origOffset, tlen;
316 cred_t *credp = crref();
317 struct afs_fakestat_state fakestat;
320 AFS_STATCNT(afs_readdir);
322 code = afs_convert_code(afs_CreateReq(&treq, credp));
327 afs_InitFakeStat(&fakestat);
328 code = afs_convert_code(afs_EvalFakeStat(&avc, &fakestat, treq));
332 /* update the cache entry */
334 code = afs_convert_code(afs_VerifyVCache2(avc, treq));
338 /* get a reference to the entire directory */
339 tdc = afs_GetDCache(avc, (afs_size_t) 0, treq, &origOffset, &tlen, 1);
345 ObtainWriteLock(&avc->lock, 811);
346 ObtainReadLock(&tdc->lock);
348 * Make sure that the data in the cache is current. There are two
349 * cases we need to worry about:
350 * 1. The cache data is being fetched by another process.
351 * 2. The cache data is no longer valid
353 while ((avc->f.states & CStatd)
354 && (tdc->dflags & DFFetching)
355 && hsame(avc->f.m.DataVersion, tdc->f.versionNo)) {
356 ReleaseReadLock(&tdc->lock);
357 ReleaseWriteLock(&avc->lock);
358 afs_osi_Sleep(&tdc->validPos);
359 ObtainWriteLock(&avc->lock, 812);
360 ObtainReadLock(&tdc->lock);
362 if (!(avc->f.states & CStatd)
363 || !hsame(avc->f.m.DataVersion, tdc->f.versionNo)) {
364 ReleaseReadLock(&tdc->lock);
365 ReleaseWriteLock(&avc->lock);
370 /* Set the readdir-in-progress flag, and downgrade the lock
371 * to shared so others will be able to acquire a read lock.
373 avc->f.states |= CReadDir;
374 avc->dcreaddir = tdc;
375 avc->readdir_pid = MyPidxx2Pid(MyPidxx);
376 ConvertWToSLock(&avc->lock);
378 /* Fill in until we get an error or we're done. This implementation
379 * takes an offset in units of blobs, rather than bytes.
382 #if defined(STRUCT_FILE_OPERATIONS_HAS_ITERATE)
385 offset = (int) fp->f_pos;
388 code = BlobScan(tdc, offset, &dirpos);
392 code = afs_dir_GetVerifiedBlob(tdc, dirpos, &entry);
394 if (!(avc->f.states & CCorrupt)) {
395 struct cell *tc = afs_GetCellStale(avc->f.fid.Cell, READ_LOCK);
396 afs_warn("Corrupt directory (%d.%d.%d.%d [%s] @%lx, pos %d)",
397 avc->f.fid.Cell, avc->f.fid.Fid.Volume,
398 avc->f.fid.Fid.Vnode, avc->f.fid.Fid.Unique,
399 tc ? tc->cellName : "",
400 (unsigned long)&tdc->f.inode, dirpos);
402 afs_PutCell(tc, READ_LOCK);
403 UpgradeSToWLock(&avc->lock, 814);
404 avc->f.states |= CCorrupt;
410 de = (struct DirEntry *)entry.data;
411 ino = afs_calc_inum (avc->f.fid.Cell, avc->f.fid.Fid.Volume,
412 ntohl(de->fid.vnode));
413 len = strlen(de->name);
415 /* filldir returns -EINVAL when the buffer is full. */
417 unsigned int type = DT_UNKNOWN;
418 struct VenusFid afid;
421 afid.Cell = avc->f.fid.Cell;
422 afid.Fid.Volume = avc->f.fid.Fid.Volume;
423 afid.Fid.Vnode = ntohl(de->fid.vnode);
424 afid.Fid.Unique = ntohl(de->fid.vunique);
425 if ((avc->f.states & CForeign) == 0 && (ntohl(de->fid.vnode) & 1)) {
427 } else if ((tvc = afs_FindVCache(&afid, 0, 0))) {
428 if (tvc->mvstat != AFS_MVSTAT_FILE) {
430 } else if (((tvc->f.states) & (CStatd | CTruth))) {
431 /* CTruth will be set if the object has
436 else if (vtype == VREG)
438 /* Don't do this until we're sure it can't be a mtpt */
439 /* else if (vtype == VLNK)
441 /* what other types does AFS support? */
443 /* clean up from afs_FindVCache */
447 * If this is NFS readdirplus, then the filler is going to
448 * call getattr on this inode, which will deadlock if we're
452 #if defined(STRUCT_FILE_OPERATIONS_HAS_ITERATE)
453 /* dir_emit returns a bool - true when it succeeds.
454 * Inverse the result to fit with how we check "code" */
455 code = !dir_emit(ctx, de->name, len, ino, type);
457 code = (*filldir) (dirbuf, de->name, len, offset, ino, type);
464 offset = dirpos + 1 + ((len + 16) >> 5);
466 /* If filldir didn't fill in the last one this is still pointing to that
472 #if defined(STRUCT_FILE_OPERATIONS_HAS_ITERATE)
473 ctx->pos = (loff_t) offset;
475 fp->f_pos = (loff_t) offset;
477 ReleaseReadLock(&tdc->lock);
479 UpgradeSToWLock(&avc->lock, 813);
480 avc->f.states &= ~CReadDir;
482 avc->readdir_pid = 0;
483 ReleaseSharedLock(&avc->lock);
486 afs_PutFakeStat(&fakestat);
487 afs_DestroyReq(treq);
494 /* in afs_pioctl.c */
495 extern int afs_xioctl(struct inode *ip, struct file *fp, unsigned int com,
498 #if defined(HAVE_UNLOCKED_IOCTL) || defined(HAVE_COMPAT_IOCTL)
499 static long afs_unlocked_xioctl(struct file *fp, unsigned int com,
501 return afs_xioctl(FILE_INODE(fp), fp, com, arg);
508 afs_linux_mmap(struct file *fp, struct vm_area_struct *vmap)
510 struct vcache *vcp = VTOAFS(FILE_INODE(fp));
514 afs_Trace3(afs_iclSetp, CM_TRACE_GMAP, ICL_TYPE_POINTER, vcp,
515 ICL_TYPE_POINTER, vmap->vm_start, ICL_TYPE_INT32,
516 vmap->vm_end - vmap->vm_start);
518 /* get a validated vcache entry */
519 code = afs_linux_VerifyVCache(vcp, NULL);
522 /* Linux's Flushpage implementation doesn't use credp, so optimise
523 * our code to not need to crref() it */
524 osi_FlushPages(vcp, NULL); /* ensure stale pages are gone */
526 code = generic_file_mmap(fp, vmap);
529 vcp->f.states |= CMAPPED;
537 afs_linux_open(struct inode *ip, struct file *fp)
539 struct vcache *vcp = VTOAFS(ip);
540 cred_t *credp = crref();
544 code = afs_open(&vcp, fp->f_flags, credp);
548 return afs_convert_code(code);
552 afs_linux_release(struct inode *ip, struct file *fp)
554 struct vcache *vcp = VTOAFS(ip);
555 cred_t *credp = crref();
559 code = afs_close(vcp, fp->f_flags, credp);
560 ObtainWriteLock(&vcp->lock, 807);
565 ReleaseWriteLock(&vcp->lock);
569 return afs_convert_code(code);
573 #if defined(FOP_FSYNC_TAKES_DENTRY)
574 afs_linux_fsync(struct file *fp, struct dentry *dp, int datasync)
575 #elif defined(FOP_FSYNC_TAKES_RANGE)
576 afs_linux_fsync(struct file *fp, loff_t start, loff_t end, int datasync)
578 afs_linux_fsync(struct file *fp, int datasync)
582 struct inode *ip = FILE_INODE(fp);
583 cred_t *credp = crref();
585 #if defined(FOP_FSYNC_TAKES_RANGE)
586 mutex_lock(&ip->i_mutex);
589 code = afs_fsync(VTOAFS(ip), credp);
591 #if defined(FOP_FSYNC_TAKES_RANGE)
592 mutex_unlock(&ip->i_mutex);
595 return afs_convert_code(code);
601 afs_linux_lock(struct file *fp, int cmd, struct file_lock *flp)
604 struct vcache *vcp = VTOAFS(FILE_INODE(fp));
605 cred_t *credp = crref();
606 struct AFS_FLOCK flock;
608 /* Convert to a lock format afs_lockctl understands. */
609 memset(&flock, 0, sizeof(flock));
610 flock.l_type = flp->fl_type;
611 flock.l_pid = flp->fl_pid;
613 flock.l_start = flp->fl_start;
614 if (flp->fl_end == OFFSET_MAX)
615 flock.l_len = 0; /* Lock to end of file */
617 flock.l_len = flp->fl_end - flp->fl_start + 1;
619 /* Safe because there are no large files, yet */
620 #if defined(F_GETLK64) && (F_GETLK != F_GETLK64)
621 if (cmd == F_GETLK64)
623 else if (cmd == F_SETLK64)
625 else if (cmd == F_SETLKW64)
627 #endif /* F_GETLK64 && F_GETLK != F_GETLK64 */
630 code = afs_convert_code(afs_lockctl(vcp, &flock, cmd, credp));
633 if ((code == 0 || flp->fl_type == F_UNLCK) &&
634 (cmd == F_SETLK || cmd == F_SETLKW)) {
635 code = afs_posix_lock_file(fp, flp);
636 if (code && flp->fl_type != F_UNLCK) {
637 struct AFS_FLOCK flock2;
639 flock2.l_type = F_UNLCK;
641 afs_lockctl(vcp, &flock2, F_SETLK, credp);
645 /* If lockctl says there are no conflicting locks, then also check with the
646 * kernel, as lockctl knows nothing about byte range locks
648 if (code == 0 && cmd == F_GETLK && flock.l_type == F_UNLCK) {
649 afs_posix_test_lock(fp, flp);
650 /* If we found a lock in the kernel's structure, return it */
651 if (flp->fl_type != F_UNLCK) {
657 /* Convert flock back to Linux's file_lock */
658 flp->fl_type = flock.l_type;
659 flp->fl_pid = flock.l_pid;
660 flp->fl_start = flock.l_start;
661 if (flock.l_len == 0)
662 flp->fl_end = OFFSET_MAX; /* Lock to end of file */
664 flp->fl_end = flock.l_start + flock.l_len - 1;
670 #ifdef STRUCT_FILE_OPERATIONS_HAS_FLOCK
672 afs_linux_flock(struct file *fp, int cmd, struct file_lock *flp) {
674 struct vcache *vcp = VTOAFS(FILE_INODE(fp));
675 cred_t *credp = crref();
676 struct AFS_FLOCK flock;
677 /* Convert to a lock format afs_lockctl understands. */
678 memset(&flock, 0, sizeof(flock));
679 flock.l_type = flp->fl_type;
680 flock.l_pid = flp->fl_pid;
685 /* Safe because there are no large files, yet */
686 #if defined(F_GETLK64) && (F_GETLK != F_GETLK64)
687 if (cmd == F_GETLK64)
689 else if (cmd == F_SETLK64)
691 else if (cmd == F_SETLKW64)
693 #endif /* F_GETLK64 && F_GETLK != F_GETLK64 */
696 code = afs_convert_code(afs_lockctl(vcp, &flock, cmd, credp));
699 if ((code == 0 || flp->fl_type == F_UNLCK) &&
700 (cmd == F_SETLK || cmd == F_SETLKW)) {
701 flp->fl_flags &=~ FL_SLEEP;
702 code = flock_lock_file_wait(fp, flp);
703 if (code && flp->fl_type != F_UNLCK) {
704 struct AFS_FLOCK flock2;
706 flock2.l_type = F_UNLCK;
708 afs_lockctl(vcp, &flock2, F_SETLK, credp);
712 /* Convert flock back to Linux's file_lock */
713 flp->fl_type = flock.l_type;
714 flp->fl_pid = flock.l_pid;
722 * essentially the same as afs_fsync() but we need to get the return
723 * code for the sys_close() here, not afs_linux_release(), so call
724 * afs_StoreAllSegments() with AFS_LASTSTORE
727 #if defined(FOP_FLUSH_TAKES_FL_OWNER_T)
728 afs_linux_flush(struct file *fp, fl_owner_t id)
730 afs_linux_flush(struct file *fp)
733 struct vrequest *treq = NULL;
741 if ((fp->f_flags & O_ACCMODE) == O_RDONLY) { /* readers dont flush */
749 vcp = VTOAFS(FILE_INODE(fp));
751 code = afs_CreateReq(&treq, credp);
754 /* If caching is bypassed for this file, or globally, just return 0 */
755 if (cache_bypass_strategy == ALWAYS_BYPASS_CACHE)
758 ObtainReadLock(&vcp->lock);
759 if (vcp->cachingStates & FCSBypass)
761 ReleaseReadLock(&vcp->lock);
764 /* future proof: don't rely on 0 return from afs_InitReq */
769 ObtainSharedLock(&vcp->lock, 535);
770 if ((vcp->execsOrWriters > 0) && (file_count(fp) == 1)) {
771 UpgradeSToWLock(&vcp->lock, 536);
772 if (!AFS_IS_DISCONNECTED) {
773 code = afs_StoreAllSegments(vcp,
775 AFS_SYNC | AFS_LASTSTORE);
777 afs_DisconAddDirty(vcp, VDisconWriteOsiFlush, 1);
779 ConvertWToSLock(&vcp->lock);
781 code = afs_CheckCode(code, treq, 54);
782 ReleaseSharedLock(&vcp->lock);
785 afs_DestroyReq(treq);
790 return afs_convert_code(code);
793 struct file_operations afs_dir_fops = {
794 .read = generic_read_dir,
795 #if defined(STRUCT_FILE_OPERATIONS_HAS_ITERATE)
796 .iterate = afs_linux_readdir,
798 .readdir = afs_linux_readdir,
800 #ifdef HAVE_UNLOCKED_IOCTL
801 .unlocked_ioctl = afs_unlocked_xioctl,
805 #ifdef HAVE_COMPAT_IOCTL
806 .compat_ioctl = afs_unlocked_xioctl,
808 .open = afs_linux_open,
809 .release = afs_linux_release,
810 .llseek = default_llseek,
811 #ifdef HAVE_LINUX_NOOP_FSYNC
814 .fsync = simple_sync_file,
818 struct file_operations afs_file_fops = {
819 #ifdef STRUCT_FILE_OPERATIONS_HAS_READ_ITER
820 .read_iter = afs_linux_read_iter,
821 .write_iter = afs_linux_write_iter,
822 # if !defined(HAVE_LINUX___VFS_READ)
823 .read = new_sync_read,
824 .write = new_sync_write,
826 #elif defined(HAVE_LINUX_GENERIC_FILE_AIO_READ)
827 .aio_read = afs_linux_aio_read,
828 .aio_write = afs_linux_aio_write,
829 .read = do_sync_read,
830 .write = do_sync_write,
832 .read = afs_linux_read,
833 .write = afs_linux_write,
835 #ifdef HAVE_UNLOCKED_IOCTL
836 .unlocked_ioctl = afs_unlocked_xioctl,
840 #ifdef HAVE_COMPAT_IOCTL
841 .compat_ioctl = afs_unlocked_xioctl,
843 .mmap = afs_linux_mmap,
844 .open = afs_linux_open,
845 .flush = afs_linux_flush,
846 #if defined(STRUCT_FILE_OPERATIONS_HAS_SENDFILE)
847 .sendfile = generic_file_sendfile,
849 #if defined(STRUCT_FILE_OPERATIONS_HAS_SPLICE) && !defined(HAVE_LINUX_DEFAULT_FILE_SPLICE_READ)
850 # if defined(HAVE_LINUX_ITER_FILE_SPLICE_WRITE)
851 .splice_write = iter_file_splice_write,
853 .splice_write = generic_file_splice_write,
855 .splice_read = generic_file_splice_read,
857 .release = afs_linux_release,
858 .fsync = afs_linux_fsync,
859 .lock = afs_linux_lock,
860 #ifdef STRUCT_FILE_OPERATIONS_HAS_FLOCK
861 .flock = afs_linux_flock,
863 .llseek = default_llseek,
866 static struct dentry *
867 canonical_dentry(struct inode *ip)
869 struct vcache *vcp = VTOAFS(ip);
870 struct dentry *first = NULL, *ret = NULL, *cur;
871 #if defined(D_ALIAS_IS_HLIST) && !defined(HLIST_ITERATOR_NO_NODE)
872 struct hlist_node *p;
876 * if vcp->target_link is set, and can be found in ip->i_dentry, use that.
877 * otherwise, use the first dentry in ip->i_dentry.
878 * if ip->i_dentry is empty, use the 'dentry' argument we were given.
880 /* note that vcp->target_link specifies which dentry to use, but we have
881 * no reference held on that dentry. so, we cannot use or dereference
882 * vcp->target_link itself, since it may have been freed. instead, we only
883 * use it to compare to pointers in the ip->i_dentry list. */
887 # ifdef HAVE_DCACHE_LOCK
888 spin_lock(&dcache_lock);
890 spin_lock(&ip->i_lock);
893 #if defined(D_ALIAS_IS_HLIST)
894 # if defined(HLIST_ITERATOR_NO_NODE)
895 hlist_for_each_entry(cur, &ip->i_dentry, d_alias) {
897 hlist_for_each_entry(cur, p, &ip->i_dentry, d_alias) {
900 list_for_each_entry_reverse(cur, &ip->i_dentry, d_alias) {
903 if (!vcp->target_link || cur == vcp->target_link) {
916 vcp->target_link = ret;
918 # ifdef HAVE_DCACHE_LOCK
922 spin_unlock(&dcache_lock);
927 spin_unlock(&ip->i_lock);
933 /**********************************************************************
934 * AFS Linux dentry operations
935 **********************************************************************/
937 /* afs_linux_revalidate
938 * Ensure vcache is stat'd before use. Return 0 if entry is valid.
941 afs_linux_revalidate(struct dentry *dp)
943 struct vattr *vattr = NULL;
944 struct vcache *vcp = VTOAFS(dp->d_inode);
948 if (afs_shuttingdown != AFS_RUNNING)
953 code = afs_CreateAttr(&vattr);
958 /* This avoids the crref when we don't have to do it. Watch for
959 * changes in afs_getattr that don't get replicated here!
961 if (vcp->f.states & CStatd &&
962 (!afs_fakestat_enable || vcp->mvstat != AFS_MVSTAT_MTPT) &&
964 (vType(vcp) == VDIR || vType(vcp) == VLNK)) {
965 code = afs_CopyOutAttrs(vcp, vattr);
968 code = afs_getattr(vcp, vattr, credp);
973 afs_fill_inode(AFSTOV(vcp), vattr);
975 afs_DestroyAttr(vattr);
980 return afs_convert_code(code);
984 * Set iattr data into vattr. Assume vattr cleared before call.
987 iattr2vattr(struct vattr *vattrp, struct iattr *iattrp)
989 vattrp->va_mask = iattrp->ia_valid;
990 if (iattrp->ia_valid & ATTR_MODE)
991 vattrp->va_mode = iattrp->ia_mode;
992 if (iattrp->ia_valid & ATTR_UID)
993 vattrp->va_uid = afs_from_kuid(iattrp->ia_uid);
994 if (iattrp->ia_valid & ATTR_GID)
995 vattrp->va_gid = afs_from_kgid(iattrp->ia_gid);
996 if (iattrp->ia_valid & ATTR_SIZE)
997 vattrp->va_size = iattrp->ia_size;
998 if (iattrp->ia_valid & ATTR_ATIME) {
999 vattrp->va_atime.tv_sec = iattrp->ia_atime.tv_sec;
1000 vattrp->va_atime.tv_usec = 0;
1002 if (iattrp->ia_valid & ATTR_MTIME) {
1003 vattrp->va_mtime.tv_sec = iattrp->ia_mtime.tv_sec;
1004 vattrp->va_mtime.tv_usec = 0;
1006 if (iattrp->ia_valid & ATTR_CTIME) {
1007 vattrp->va_ctime.tv_sec = iattrp->ia_ctime.tv_sec;
1008 vattrp->va_ctime.tv_usec = 0;
1013 * Rewrite the inode cache from the attr. Assumes all vattr fields are valid.
1016 vattr2inode(struct inode *ip, struct vattr *vp)
1018 ip->i_ino = vp->va_nodeid;
1019 #ifdef HAVE_LINUX_SET_NLINK
1020 set_nlink(ip, vp->va_nlink);
1022 ip->i_nlink = vp->va_nlink;
1024 ip->i_blocks = vp->va_blocks;
1025 #ifdef STRUCT_INODE_HAS_I_BLKBITS
1026 ip->i_blkbits = AFS_BLKBITS;
1028 #ifdef STRUCT_INODE_HAS_I_BLKSIZE
1029 ip->i_blksize = vp->va_blocksize;
1031 ip->i_rdev = vp->va_rdev;
1032 ip->i_mode = vp->va_mode;
1033 ip->i_uid = afs_make_kuid(vp->va_uid);
1034 ip->i_gid = afs_make_kgid(vp->va_gid);
1035 i_size_write(ip, vp->va_size);
1036 ip->i_atime.tv_sec = vp->va_atime.tv_sec;
1037 ip->i_atime.tv_nsec = 0;
1038 ip->i_mtime.tv_sec = vp->va_mtime.tv_sec;
1039 /* Set the mtime nanoseconds to the sysname generation number.
1040 * This convinces NFS clients that all directories have changed
1041 * any time the sysname list changes.
1043 ip->i_mtime.tv_nsec = afs_sysnamegen;
1044 ip->i_ctime.tv_sec = vp->va_ctime.tv_sec;
1045 ip->i_ctime.tv_nsec = 0;
1048 /* afs_notify_change
1049 * Linux version of setattr call. What to change is in the iattr struct.
1050 * We need to set bits in both the Linux inode as well as the vcache.
1053 afs_notify_change(struct dentry *dp, struct iattr *iattrp)
1055 struct vattr *vattr = NULL;
1056 cred_t *credp = crref();
1057 struct inode *ip = dp->d_inode;
1061 code = afs_CreateAttr(&vattr);
1066 iattr2vattr(vattr, iattrp); /* Convert for AFS vnodeops call. */
1068 code = afs_setattr(VTOAFS(ip), vattr, credp);
1070 afs_getattr(VTOAFS(ip), vattr, credp);
1071 vattr2inode(ip, vattr);
1073 afs_DestroyAttr(vattr);
1078 return afs_convert_code(code);
1082 afs_linux_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1084 int err = afs_linux_revalidate(dentry);
1086 generic_fillattr(dentry->d_inode, stat);
1092 parent_vcache_dv(struct inode *inode, cred_t *credp, int locked)
1095 struct vcache *pvcp;
1098 * If parent is a mount point and we are using fakestat, we may need
1099 * to look at the fake vcache entry instead of what the vfs is giving
1100 * us. The fake entry is the one with the useful DataVersion.
1102 pvcp = VTOAFS(inode);
1103 if (pvcp->mvstat == AFS_MVSTAT_MTPT && afs_fakestat_enable) {
1104 struct vrequest treq;
1105 struct afs_fakestat_state fakestate;
1114 afs_InitReq(&treq, credp);
1115 afs_InitFakeStat(&fakestate);
1116 afs_TryEvalFakeStat(&pvcp, &fakestate, &treq);
1119 afs_PutFakeStat(&fakestate);
1124 return hgetlo(pvcp->f.m.DataVersion);
1127 /* Validate a dentry. Return 1 if unchanged, 0 if VFS layer should re-evaluate.
1128 * In kernels 2.2.10 and above, we are passed an additional flags var which
1129 * may have either the LOOKUP_FOLLOW OR LOOKUP_DIRECTORY set in which case
1130 * we are advised to follow the entry if it is a link or to make sure that
1131 * it is a directory. But since the kernel itself checks these possibilities
1132 * later on, we shouldn't have to do it until later. Perhaps in the future..
1134 * The code here assumes that on entry the global lock is not held
1137 #if defined(DOP_REVALIDATE_TAKES_UNSIGNED)
1138 afs_linux_dentry_revalidate(struct dentry *dp, unsigned int flags)
1139 #elif defined(DOP_REVALIDATE_TAKES_NAMEIDATA)
1140 afs_linux_dentry_revalidate(struct dentry *dp, struct nameidata *nd)
1142 afs_linux_dentry_revalidate(struct dentry *dp, int flags)
1145 cred_t *credp = NULL;
1146 struct vcache *vcp, *pvcp, *tvc = NULL;
1147 struct dentry *parent;
1149 struct afs_fakestat_state fakestate;
1152 afs_uint32 parent_dv;
1155 /* We don't support RCU path walking */
1156 # if defined(DOP_REVALIDATE_TAKES_UNSIGNED)
1157 if (flags & LOOKUP_RCU)
1159 if (nd->flags & LOOKUP_RCU)
1164 afs_InitFakeStat(&fakestate);
1167 vcp = VTOAFS(dp->d_inode);
1169 if (vcp == afs_globalVp)
1172 parent = dget_parent(dp);
1173 pvcp = VTOAFS(parent->d_inode);
1175 if ((vcp->mvstat != AFS_MVSTAT_FILE) ||
1176 (pvcp->mvstat == AFS_MVSTAT_MTPT && afs_fakestat_enable)) { /* need to lock */
1183 if (vcp->mvstat == AFS_MVSTAT_MTPT) {
1184 if (vcp->mvid.target_root && (vcp->f.states & CMValid)) {
1185 int tryEvalOnly = 0;
1187 struct vrequest *treq = NULL;
1189 code = afs_CreateReq(&treq, credp);
1194 if ((strcmp(dp->d_name.name, ".directory") == 0)) {
1198 code = afs_TryEvalFakeStat(&vcp, &fakestate, treq);
1200 code = afs_EvalFakeStat(&vcp, &fakestate, treq);
1201 afs_DestroyReq(treq);
1202 if ((tryEvalOnly && vcp->mvstat == AFS_MVSTAT_MTPT) || code) {
1203 /* a mount point, not yet replaced by its directory */
1208 } else if (vcp->mvstat == AFS_MVSTAT_ROOT && *dp->d_name.name != '/') {
1209 osi_Assert(vcp->mvid.parent != NULL);
1214 /* If the last looker changes, we should make sure the current
1215 * looker still has permission to examine this file. This would
1216 * always require a crref() which would be "slow".
1218 if (vcp->last_looker != treq.uid) {
1219 if (!afs_AccessOK(vcp, (vType(vcp) == VREG) ? PRSFS_READ : PRSFS_LOOKUP, &treq, CHECK_MODE_BITS)) {
1224 vcp->last_looker = treq.uid;
1228 parent_dv = parent_vcache_dv(parent->d_inode, credp, locked);
1230 /* If the parent's DataVersion has changed or the vnode
1231 * is longer valid, we need to do a full lookup. VerifyVCache
1232 * isn't enough since the vnode may have been renamed.
1235 if ((!locked) && (parent_dv > dp->d_time || !(vcp->f.states & CStatd)) ) {
1241 if (locked && (parent_dv > dp->d_time || !(vcp->f.states & CStatd))) {
1242 struct vattr *vattr = NULL;
1246 code = afs_lookup(pvcp, (char *)dp->d_name.name, &tvc, credp);
1249 /* We couldn't perform the lookup, so we're not okay. */
1252 } else if (tvc == vcp) {
1253 /* We got back the same vcache, so we're good. */
1256 } else if (tvc == VTOAFS(dp->d_inode)) {
1257 /* We got back the same vcache, so we're good. This is
1258 * different from the above case, because sometimes 'vcp' is
1259 * not the same as the vcache for dp->d_inode, if 'vcp' was a
1260 * mtpt and we evaluated it to a root dir. In rare cases,
1261 * afs_lookup might not evalute the mtpt when we do, or vice
1262 * versa, so the previous case will not succeed. But this is
1263 * still 'correct', so make sure not to mark the dentry as
1264 * invalid; it still points to the same thing! */
1268 /* We got back a different file, so we're definitely not
1275 /* Force unhash; the name doesn't point to this file
1278 if (code && code != ENOENT) {
1279 /* ...except if we couldn't perform the actual lookup,
1280 * we don't know if the name points to this file or not. */
1286 code = afs_CreateAttr(&vattr);
1292 if (afs_getattr(vcp, vattr, credp)) {
1294 afs_DestroyAttr(vattr);
1298 vattr2inode(AFSTOV(vcp), vattr);
1299 dp->d_time = parent_dv;
1301 afs_DestroyAttr(vattr);
1304 /* should we always update the attributes at this point? */
1305 /* unlikely--the vcache entry hasn't changed */
1311 /* 'dp' represents a cached negative lookup. */
1313 parent = dget_parent(dp);
1314 pvcp = VTOAFS(parent->d_inode);
1315 parent_dv = parent_vcache_dv(parent->d_inode, credp, locked);
1317 if (parent_dv > dp->d_time || !(pvcp->f.states & CStatd)
1318 || afs_IsDynroot(pvcp)) {
1333 afs_PutFakeStat(&fakestate); /* from here on vcp may be no longer valid */
1335 /* we hold the global lock if we evaluated a mount point */
1343 * If we had a negative lookup for the name we want to forcibly
1344 * unhash the dentry.
1345 * Otherwise use d_invalidate which will not unhash it if still in use.
1348 shrink_dcache_parent(dp);
1357 if (have_submounts(dp))
1365 afs_dentry_iput(struct dentry *dp, struct inode *ip)
1367 struct vcache *vcp = VTOAFS(ip);
1370 if (!AFS_IS_DISCONNECTED || (vcp->f.states & CUnlinked)) {
1371 (void) afs_InactiveVCache(vcp, NULL);
1374 afs_linux_clear_nfsfs_renamed(dp);
1380 #if defined(DOP_D_DELETE_TAKES_CONST)
1381 afs_dentry_delete(const struct dentry *dp)
1383 afs_dentry_delete(struct dentry *dp)
1386 if (dp->d_inode && (VTOAFS(dp->d_inode)->f.states & CUnlinked))
1387 return 1; /* bad inode? */
1392 #ifdef STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT
1393 static struct vfsmount *
1394 afs_dentry_automount(afs_linux_path_t *path)
1396 struct dentry *target;
1399 * Avoid symlink resolution limits when resolving; we cannot contribute to
1400 * an infinite symlink loop.
1402 * On newer kernels the field has moved to the private nameidata structure
1403 * so we can't adjust it here. This may cause ELOOP when using a path with
1404 * 40 or more directories that are not already in the dentry cache.
1406 #if defined(STRUCT_TASK_STRUCT_HAS_TOTAL_LINK_COUNT)
1407 current->total_link_count--;
1410 target = canonical_dentry(path->dentry->d_inode);
1412 if (target == path->dentry) {
1419 path->dentry = target;
1422 spin_lock(&path->dentry->d_lock);
1423 path->dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
1424 spin_unlock(&path->dentry->d_lock);
1429 #endif /* STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT */
1431 struct dentry_operations afs_dentry_operations = {
1432 .d_revalidate = afs_linux_dentry_revalidate,
1433 .d_delete = afs_dentry_delete,
1434 .d_iput = afs_dentry_iput,
1435 #ifdef STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT
1436 .d_automount = afs_dentry_automount,
1437 #endif /* STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT */
1440 /**********************************************************************
1441 * AFS Linux inode operations
1442 **********************************************************************/
1446 * Merely need to set enough of vattr to get us through the create. Note
1447 * that the higher level code (open_namei) will take care of any tuncation
1448 * explicitly. Exclusive open is also taken care of in open_namei.
1450 * name is in kernel space at this point.
1453 #if defined(IOP_CREATE_TAKES_BOOL)
1454 afs_linux_create(struct inode *dip, struct dentry *dp, umode_t mode,
1456 #elif defined(IOP_CREATE_TAKES_UMODE_T)
1457 afs_linux_create(struct inode *dip, struct dentry *dp, umode_t mode,
1458 struct nameidata *nd)
1459 #elif defined(IOP_CREATE_TAKES_NAMEIDATA)
1460 afs_linux_create(struct inode *dip, struct dentry *dp, int mode,
1461 struct nameidata *nd)
1463 afs_linux_create(struct inode *dip, struct dentry *dp, int mode)
1466 struct vattr *vattr = NULL;
1467 cred_t *credp = crref();
1468 const char *name = dp->d_name.name;
1474 code = afs_CreateAttr(&vattr);
1478 vattr->va_mode = mode;
1479 vattr->va_type = mode & S_IFMT;
1481 code = afs_create(VTOAFS(dip), (char *)name, vattr, NONEXCL, mode,
1485 struct inode *ip = AFSTOV(vcp);
1487 afs_getattr(vcp, vattr, credp);
1488 afs_fill_inode(ip, vattr);
1489 insert_inode_hash(ip);
1490 #if !defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
1491 dp->d_op = &afs_dentry_operations;
1493 dp->d_time = parent_vcache_dv(dip, credp, 1);
1494 d_instantiate(dp, ip);
1497 afs_DestroyAttr(vattr);
1503 return afs_convert_code(code);
1506 /* afs_linux_lookup */
1507 static struct dentry *
1508 #if defined(IOP_LOOKUP_TAKES_UNSIGNED)
1509 afs_linux_lookup(struct inode *dip, struct dentry *dp,
1511 #elif defined(IOP_LOOKUP_TAKES_NAMEIDATA)
1512 afs_linux_lookup(struct inode *dip, struct dentry *dp,
1513 struct nameidata *nd)
1515 afs_linux_lookup(struct inode *dip, struct dentry *dp)
1518 cred_t *credp = crref();
1519 struct vcache *vcp = NULL;
1520 const char *comp = dp->d_name.name;
1521 struct inode *ip = NULL;
1522 struct dentry *newdp = NULL;
1526 code = afs_lookup(VTOAFS(dip), (char *)comp, &vcp, credp);
1529 struct vattr *vattr = NULL;
1530 struct vcache *parent_vc = VTOAFS(dip);
1532 if (parent_vc == vcp) {
1533 /* This is possible if the parent dir is a mountpoint to a volume,
1534 * and the dir entry we looked up is a mountpoint to the same
1535 * volume. Linux cannot cope with this, so return an error instead
1536 * of risking a deadlock or panic. */
1543 code = afs_CreateAttr(&vattr);
1551 afs_getattr(vcp, vattr, credp);
1552 afs_fill_inode(ip, vattr);
1553 if (hlist_unhashed(&ip->i_hash))
1554 insert_inode_hash(ip);
1556 afs_DestroyAttr(vattr);
1558 #if !defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
1559 dp->d_op = &afs_dentry_operations;
1561 dp->d_time = parent_vcache_dv(dip, credp, 1);
1565 if (ip && S_ISDIR(ip->i_mode)) {
1566 d_prune_aliases(ip);
1568 #ifdef STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT
1569 /* Only needed if this is a volume root */
1570 if (vcp->mvstat == 2)
1571 ip->i_flags |= S_AUTOMOUNT;
1575 * Take an extra reference so the inode doesn't go away if
1576 * d_splice_alias drops our reference on error.
1579 #ifdef HAVE_LINUX_IHOLD
1585 newdp = d_splice_alias(ip, dp);
1590 /* It's ok for the file to not be found. That's noted by the caller by
1591 * seeing that the dp->d_inode field is NULL.
1593 if (!code || code == ENOENT) {
1595 * d_splice_alias can return an error (EIO) if there is an existing
1596 * connected directory alias for this dentry.
1598 if (!IS_ERR(newdp)) {
1604 * Depending on the kernel version, d_splice_alias may or may
1605 * not drop the inode reference on error. If it didn't, do it
1608 #if defined(D_SPLICE_ALIAS_LEAK_ON_ERROR)
1616 return ERR_PTR(afs_convert_code(code));
1621 afs_linux_link(struct dentry *olddp, struct inode *dip, struct dentry *newdp)
1624 cred_t *credp = crref();
1625 const char *name = newdp->d_name.name;
1626 struct inode *oldip = olddp->d_inode;
1628 /* If afs_link returned the vnode, we could instantiate the
1629 * dentry. Since it's not, we drop this one and do a new lookup.
1634 code = afs_link(VTOAFS(oldip), VTOAFS(dip), (char *)name, credp);
1638 return afs_convert_code(code);
1641 /* We have to have a Linux specific sillyrename function, because we
1642 * also have to keep the dcache up to date when we're doing a silly
1643 * rename - so we don't want the generic vnodeops doing this behind our
1648 afs_linux_sillyrename(struct inode *dir, struct dentry *dentry,
1651 struct vcache *tvc = VTOAFS(dentry->d_inode);
1652 struct dentry *__dp = NULL;
1653 char *__name = NULL;
1656 if (afs_linux_nfsfs_renamed(dentry))
1664 osi_FreeSmallSpace(__name);
1665 __name = afs_newname();
1668 __dp = lookup_one_len(__name, dentry->d_parent, strlen(__name));
1671 osi_FreeSmallSpace(__name);
1674 } while (__dp->d_inode != NULL);
1677 code = afs_rename(VTOAFS(dir), (char *)dentry->d_name.name,
1678 VTOAFS(dir), (char *)__dp->d_name.name,
1681 tvc->mvid.silly_name = __name;
1684 crfree(tvc->uncred);
1686 tvc->uncred = credp;
1687 tvc->f.states |= CUnlinked;
1688 afs_linux_set_nfsfs_renamed(dentry);
1690 __dp->d_time = 0; /* force to revalidate */
1691 d_move(dentry, __dp);
1693 osi_FreeSmallSpace(__name);
1704 afs_linux_unlink(struct inode *dip, struct dentry *dp)
1707 cred_t *credp = crref();
1708 const char *name = dp->d_name.name;
1709 struct vcache *tvc = VTOAFS(dp->d_inode);
1711 if (VREFCOUNT(tvc) > 1 && tvc->opens > 0
1712 && !(tvc->f.states & CUnlinked)) {
1714 code = afs_linux_sillyrename(dip, dp, credp);
1717 code = afs_remove(VTOAFS(dip), (char *)name, credp);
1724 return afs_convert_code(code);
1729 afs_linux_symlink(struct inode *dip, struct dentry *dp, const char *target)
1732 cred_t *credp = crref();
1733 struct vattr *vattr = NULL;
1734 const char *name = dp->d_name.name;
1736 /* If afs_symlink returned the vnode, we could instantiate the
1737 * dentry. Since it's not, we drop this one and do a new lookup.
1742 code = afs_CreateAttr(&vattr);
1747 code = afs_symlink(VTOAFS(dip), (char *)name, vattr, (char *)target, NULL,
1749 afs_DestroyAttr(vattr);
1754 return afs_convert_code(code);
1758 #if defined(IOP_MKDIR_TAKES_UMODE_T)
1759 afs_linux_mkdir(struct inode *dip, struct dentry *dp, umode_t mode)
1761 afs_linux_mkdir(struct inode *dip, struct dentry *dp, int mode)
1765 cred_t *credp = crref();
1766 struct vcache *tvcp = NULL;
1767 struct vattr *vattr = NULL;
1768 const char *name = dp->d_name.name;
1771 code = afs_CreateAttr(&vattr);
1776 vattr->va_mask = ATTR_MODE;
1777 vattr->va_mode = mode;
1779 code = afs_mkdir(VTOAFS(dip), (char *)name, vattr, &tvcp, credp);
1782 struct inode *ip = AFSTOV(tvcp);
1784 afs_getattr(tvcp, vattr, credp);
1785 afs_fill_inode(ip, vattr);
1787 #if !defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
1788 dp->d_op = &afs_dentry_operations;
1790 dp->d_time = parent_vcache_dv(dip, credp, 1);
1791 d_instantiate(dp, ip);
1793 afs_DestroyAttr(vattr);
1799 return afs_convert_code(code);
1803 afs_linux_rmdir(struct inode *dip, struct dentry *dp)
1806 cred_t *credp = crref();
1807 const char *name = dp->d_name.name;
1809 /* locking kernel conflicts with glock? */
1812 code = afs_rmdir(VTOAFS(dip), (char *)name, credp);
1815 /* Linux likes to see ENOTEMPTY returned from an rmdir() syscall
1816 * that failed because a directory is not empty. So, we map
1817 * EEXIST to ENOTEMPTY on linux.
1819 if (code == EEXIST) {
1828 return afs_convert_code(code);
1833 afs_linux_rename(struct inode *oldip, struct dentry *olddp,
1834 struct inode *newip, struct dentry *newdp)
1837 cred_t *credp = crref();
1838 const char *oldname = olddp->d_name.name;
1839 const char *newname = newdp->d_name.name;
1840 struct dentry *rehash = NULL;
1842 /* Prevent any new references during rename operation. */
1844 if (!d_unhashed(newdp)) {
1849 afs_maybe_shrink_dcache(olddp);
1852 code = afs_rename(VTOAFS(oldip), (char *)oldname, VTOAFS(newip), (char *)newname, credp);
1856 olddp->d_time = 0; /* force to revalidate */
1862 return afs_convert_code(code);
1866 /* afs_linux_ireadlink
1867 * Internal readlink which can return link contents to user or kernel space.
1868 * Note that the buffer is NOT supposed to be null-terminated.
1871 afs_linux_ireadlink(struct inode *ip, char *target, int maxlen, uio_seg_t seg)
1874 cred_t *credp = crref();
1878 memset(&tuio, 0, sizeof(tuio));
1879 memset(&iov, 0, sizeof(iov));
1881 setup_uio(&tuio, &iov, target, (afs_offs_t) 0, maxlen, UIO_READ, seg);
1882 code = afs_readlink(VTOAFS(ip), &tuio, credp);
1886 return maxlen - tuio.uio_resid;
1888 return afs_convert_code(code);
1891 #if !defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE)
1892 /* afs_linux_readlink
1893 * Fill target (which is in user space) with contents of symlink.
1896 afs_linux_readlink(struct dentry *dp, char *target, int maxlen)
1899 struct inode *ip = dp->d_inode;
1902 code = afs_linux_ireadlink(ip, target, maxlen, AFS_UIOUSER);
1908 /* afs_linux_follow_link
1909 * a file system dependent link following routine.
1911 #if defined(HAVE_LINUX_INODE_OPERATIONS_FOLLOW_LINK_NO_NAMEIDATA)
1912 static const char *afs_linux_follow_link(struct dentry *dentry, void **link_data)
1914 static int afs_linux_follow_link(struct dentry *dentry, struct nameidata *nd)
1920 name = kmalloc(PATH_MAX, GFP_NOFS);
1922 #if defined(HAVE_LINUX_INODE_OPERATIONS_FOLLOW_LINK_NO_NAMEIDATA)
1923 return ERR_PTR(-EIO);
1930 code = afs_linux_ireadlink(dentry->d_inode, name, PATH_MAX - 1, AFS_UIOSYS);
1934 #if defined(HAVE_LINUX_INODE_OPERATIONS_FOLLOW_LINK_NO_NAMEIDATA)
1935 return ERR_PTR(code);
1942 #if defined(HAVE_LINUX_INODE_OPERATIONS_FOLLOW_LINK_NO_NAMEIDATA)
1943 return *link_data = name;
1945 nd_set_link(nd, name);
1950 #if defined(HAVE_LINUX_INODE_OPERATIONS_PUT_LINK_NO_NAMEIDATA)
1952 afs_linux_put_link(struct inode *inode, void *link_data)
1954 char *name = link_data;
1956 if (name && !IS_ERR(name))
1961 afs_linux_put_link(struct dentry *dentry, struct nameidata *nd)
1963 char *name = nd_get_link(nd);
1965 if (name && !IS_ERR(name))
1968 #endif /* HAVE_LINUX_INODE_OPERATIONS_PUT_LINK_NO_NAMEIDATA */
1970 #endif /* USABLE_KERNEL_PAGE_SYMLINK_CACHE */
1972 /* Populate a page by filling it from the cache file pointed at by cachefp
1973 * (which contains indicated chunk)
1974 * If task is NULL, the page copy occurs syncronously, and the routine
1975 * returns with page still locked. If task is non-NULL, then page copies
1976 * may occur in the background, and the page will be unlocked when it is
1980 afs_linux_read_cache(struct file *cachefp, struct page *page,
1981 int chunk, struct pagevec *lrupv,
1982 struct afs_pagecopy_task *task) {
1983 loff_t offset = page_offset(page);
1984 struct inode *cacheinode = cachefp->f_dentry->d_inode;
1985 struct page *newpage, *cachepage;
1986 struct address_space *cachemapping;
1990 cachemapping = cacheinode->i_mapping;
1994 /* If we're trying to read a page that's past the end of the disk
1995 * cache file, then just return a zeroed page */
1996 if (AFS_CHUNKOFFSET(offset) >= i_size_read(cacheinode)) {
1997 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1998 SetPageUptodate(page);
2004 /* From our offset, we now need to work out which page in the disk
2005 * file it corresponds to. This will be fun ... */
2006 pageindex = (offset - AFS_CHUNKTOBASE(chunk)) >> PAGE_CACHE_SHIFT;
2008 while (cachepage == NULL) {
2009 cachepage = find_get_page(cachemapping, pageindex);
2012 newpage = page_cache_alloc_cold(cachemapping);
2018 code = add_to_page_cache(newpage, cachemapping,
2019 pageindex, GFP_KERNEL);
2021 cachepage = newpage;
2024 page_cache_get(cachepage);
2025 if (!pagevec_add(lrupv, cachepage))
2026 __pagevec_lru_add_file(lrupv);
2029 page_cache_release(newpage);
2031 if (code != -EEXIST)
2035 lock_page(cachepage);
2039 if (!PageUptodate(cachepage)) {
2040 ClearPageError(cachepage);
2041 code = cachemapping->a_ops->readpage(NULL, cachepage);
2042 if (!code && !task) {
2043 wait_on_page_locked(cachepage);
2046 unlock_page(cachepage);
2050 if (PageUptodate(cachepage)) {
2051 copy_highpage(page, cachepage);
2052 flush_dcache_page(page);
2053 SetPageUptodate(page);
2058 afs_pagecopy_queue_page(task, cachepage, page);
2070 page_cache_release(cachepage);
2076 afs_linux_readpage_fastpath(struct file *fp, struct page *pp, int *codep)
2078 loff_t offset = page_offset(pp);
2079 struct inode *ip = FILE_INODE(fp);
2080 struct vcache *avc = VTOAFS(ip);
2082 struct file *cacheFp = NULL;
2085 struct pagevec lrupv;
2087 /* Not a UFS cache, don't do anything */
2088 if (cacheDiskType != AFS_FCACHE_TYPE_UFS)
2091 /* No readpage (ex: tmpfs) , skip */
2092 if (cachefs_noreadpage)
2095 /* Can't do anything if the vcache isn't statd , or if the read
2096 * crosses a chunk boundary.
2098 if (!(avc->f.states & CStatd) ||
2099 AFS_CHUNK(offset) != AFS_CHUNK(offset + PAGE_SIZE)) {
2103 ObtainWriteLock(&avc->lock, 911);
2105 /* XXX - See if hinting actually makes things faster !!! */
2107 /* See if we have a suitable entry already cached */
2111 /* We need to lock xdcache, then dcache, to handle situations where
2112 * the hint is on the free list. However, we can't safely do this
2113 * according to the locking hierarchy. So, use a non blocking lock.
2115 ObtainReadLock(&afs_xdcache);
2116 dcLocked = ( 0 == NBObtainReadLock(&tdc->lock));
2118 if (dcLocked && (tdc->index != NULLIDX)
2119 && !FidCmp(&tdc->f.fid, &avc->f.fid)
2120 && tdc->f.chunk == AFS_CHUNK(offset)
2121 && !(afs_indexFlags[tdc->index] & (IFFree | IFDiscarded))) {
2122 /* Bonus - the hint was correct */
2125 /* Only destroy the hint if its actually invalid, not if there's
2126 * just been a locking failure */
2128 ReleaseReadLock(&tdc->lock);
2135 ReleaseReadLock(&afs_xdcache);
2138 /* No hint, or hint is no longer valid - see if we can get something
2139 * directly from the dcache
2142 tdc = afs_FindDCache(avc, offset);
2145 ReleaseWriteLock(&avc->lock);
2150 ObtainReadLock(&tdc->lock);
2152 /* Is the dcache we've been given currently up to date */
2153 if (!hsame(avc->f.m.DataVersion, tdc->f.versionNo) ||
2154 (tdc->dflags & DFFetching))
2157 /* Update our hint for future abuse */
2160 /* Okay, so we've now got a cache file that is up to date */
2162 /* XXX - I suspect we should be locking the inodes before we use them! */
2164 cacheFp = afs_linux_raw_open(&tdc->f.inode);
2165 if (!cacheFp->f_dentry->d_inode->i_mapping->a_ops->readpage) {
2166 cachefs_noreadpage = 1;
2170 pagevec_init(&lrupv, 0);
2172 code = afs_linux_read_cache(cacheFp, pp, tdc->f.chunk, &lrupv, NULL);
2174 if (pagevec_count(&lrupv))
2175 __pagevec_lru_add_file(&lrupv);
2177 filp_close(cacheFp, NULL);
2180 ReleaseReadLock(&tdc->lock);
2181 ReleaseWriteLock(&avc->lock);
2188 ReleaseWriteLock(&avc->lock);
2189 ReleaseReadLock(&tdc->lock);
2194 /* afs_linux_readpage
2196 * This function is split into two, because prepare_write/begin_write
2197 * require a readpage call which doesn't unlock the resulting page upon
2201 afs_linux_fillpage(struct file *fp, struct page *pp)
2206 struct iovec *iovecp;
2207 struct inode *ip = FILE_INODE(fp);
2208 afs_int32 cnt = page_count(pp);
2209 struct vcache *avc = VTOAFS(ip);
2210 afs_offs_t offset = page_offset(pp);
2214 if (afs_linux_readpage_fastpath(fp, pp, &code)) {
2224 auio = kmalloc(sizeof(struct uio), GFP_NOFS);
2225 iovecp = kmalloc(sizeof(struct iovec), GFP_NOFS);
2227 setup_uio(auio, iovecp, (char *)address, offset, PAGE_SIZE, UIO_READ,
2232 afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE, ICL_TYPE_POINTER, ip,
2233 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, cnt, ICL_TYPE_INT32,
2234 99999); /* not a possible code value */
2236 code = afs_rdwr(avc, auio, UIO_READ, 0, credp);
2238 afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE, ICL_TYPE_POINTER, ip,
2239 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, cnt, ICL_TYPE_INT32,
2241 AFS_DISCON_UNLOCK();
2244 /* XXX valid for no-cache also? Check last bits of files... :)
2245 * Cognate code goes in afs_NoCacheFetchProc. */
2246 if (auio->uio_resid) /* zero remainder of page */
2247 memset((void *)(address + (PAGE_SIZE - auio->uio_resid)), 0,
2250 flush_dcache_page(pp);
2251 SetPageUptodate(pp);
2260 return afs_convert_code(code);
2264 afs_linux_prefetch(struct file *fp, struct page *pp)
2267 struct vcache *avc = VTOAFS(FILE_INODE(fp));
2268 afs_offs_t offset = page_offset(pp);
2270 if (AFS_CHUNKOFFSET(offset) == 0) {
2272 struct vrequest *treq = NULL;
2277 code = afs_CreateReq(&treq, credp);
2278 if (!code && !NBObtainWriteLock(&avc->lock, 534)) {
2279 tdc = afs_FindDCache(avc, offset);
2281 if (!(tdc->mflags & DFNextStarted))
2282 afs_PrefetchChunk(avc, tdc, credp, treq);
2285 ReleaseWriteLock(&avc->lock);
2287 afs_DestroyReq(treq);
2291 return afs_convert_code(code);
2296 afs_linux_bypass_readpages(struct file *fp, struct address_space *mapping,
2297 struct list_head *page_list, unsigned num_pages)
2302 struct iovec* iovecp;
2303 struct nocache_read_request *ancr;
2305 struct pagevec lrupv;
2309 struct inode *ip = FILE_INODE(fp);
2310 struct vcache *avc = VTOAFS(ip);
2311 afs_int32 base_index = 0;
2312 afs_int32 page_count = 0;
2315 /* background thread must free: iovecp, auio, ancr */
2316 iovecp = osi_Alloc(num_pages * sizeof(struct iovec));
2318 auio = osi_Alloc(sizeof(struct uio));
2319 auio->uio_iov = iovecp;
2320 auio->uio_iovcnt = num_pages;
2321 auio->uio_flag = UIO_READ;
2322 auio->uio_seg = AFS_UIOSYS;
2323 auio->uio_resid = num_pages * PAGE_SIZE;
2325 ancr = osi_Alloc(sizeof(struct nocache_read_request));
2327 ancr->offset = auio->uio_offset;
2328 ancr->length = auio->uio_resid;
2330 pagevec_init(&lrupv, 0);
2332 for(page_ix = 0; page_ix < num_pages; ++page_ix) {
2334 if(list_empty(page_list))
2337 pp = list_entry(page_list->prev, struct page, lru);
2338 /* If we allocate a page and don't remove it from page_list,
2339 * the page cache gets upset. */
2341 isize = (i_size_read(fp->f_mapping->host) - 1) >> PAGE_CACHE_SHIFT;
2342 if(pp->index > isize) {
2349 offset = page_offset(pp);
2350 ancr->offset = auio->uio_offset = offset;
2351 base_index = pp->index;
2353 iovecp[page_ix].iov_len = PAGE_SIZE;
2354 code = add_to_page_cache(pp, mapping, pp->index, GFP_KERNEL);
2355 if(base_index != pp->index) {
2358 page_cache_release(pp);
2359 iovecp[page_ix].iov_base = (void *) 0;
2361 ancr->length -= PAGE_SIZE;
2368 page_cache_release(pp);
2369 iovecp[page_ix].iov_base = (void *) 0;
2372 if(!PageLocked(pp)) {
2376 /* increment page refcount--our original design assumed
2377 * that locking it would effectively pin it; protect
2378 * ourselves from the possiblity that this assumption is
2379 * is faulty, at low cost (provided we do not fail to
2380 * do the corresponding decref on the other side) */
2383 /* save the page for background map */
2384 iovecp[page_ix].iov_base = (void*) pp;
2386 /* and put it on the LRU cache */
2387 if (!pagevec_add(&lrupv, pp))
2388 __pagevec_lru_add_file(&lrupv);
2392 /* If there were useful pages in the page list, make sure all pages
2393 * are in the LRU cache, then schedule the read */
2395 if (pagevec_count(&lrupv))
2396 __pagevec_lru_add_file(&lrupv);
2398 code = afs_ReadNoCache(avc, ancr, credp);
2401 /* If there is nothing for the background thread to handle,
2402 * it won't be freeing the things that we never gave it */
2403 osi_Free(iovecp, num_pages * sizeof(struct iovec));
2404 osi_Free(auio, sizeof(struct uio));
2405 osi_Free(ancr, sizeof(struct nocache_read_request));
2407 /* we do not flush, release, or unmap pages--that will be
2408 * done for us by the background thread as each page comes in
2409 * from the fileserver */
2410 return afs_convert_code(code);
2415 afs_linux_bypass_readpage(struct file *fp, struct page *pp)
2417 cred_t *credp = NULL;
2419 struct iovec *iovecp;
2420 struct nocache_read_request *ancr;
2424 * Special case: if page is at or past end of file, just zero it and set
2427 if (page_offset(pp) >= i_size_read(fp->f_mapping->host)) {
2428 zero_user_segment(pp, 0, PAGE_CACHE_SIZE);
2429 SetPageUptodate(pp);
2436 /* receiver frees */
2437 auio = osi_Alloc(sizeof(struct uio));
2438 iovecp = osi_Alloc(sizeof(struct iovec));
2440 /* address can be NULL, because we overwrite it with 'pp', below */
2441 setup_uio(auio, iovecp, NULL, page_offset(pp),
2442 PAGE_SIZE, UIO_READ, AFS_UIOSYS);
2444 /* save the page for background map */
2445 get_page(pp); /* see above */
2446 auio->uio_iov->iov_base = (void*) pp;
2447 /* the background thread will free this */
2448 ancr = osi_Alloc(sizeof(struct nocache_read_request));
2450 ancr->offset = page_offset(pp);
2451 ancr->length = PAGE_SIZE;
2454 code = afs_ReadNoCache(VTOAFS(FILE_INODE(fp)), ancr, credp);
2457 return afs_convert_code(code);
2461 afs_linux_can_bypass(struct inode *ip) {
2463 switch(cache_bypass_strategy) {
2464 case NEVER_BYPASS_CACHE:
2466 case ALWAYS_BYPASS_CACHE:
2468 case LARGE_FILES_BYPASS_CACHE:
2469 if (i_size_read(ip) > cache_bypass_threshold)
2476 /* Check if a file is permitted to bypass the cache by policy, and modify
2477 * the cache bypass state recorded for that file */
2480 afs_linux_bypass_check(struct inode *ip) {
2483 int bypass = afs_linux_can_bypass(ip);
2486 trydo_cache_transition(VTOAFS(ip), credp, bypass);
2494 afs_linux_readpage(struct file *fp, struct page *pp)
2498 if (afs_linux_bypass_check(FILE_INODE(fp))) {
2499 code = afs_linux_bypass_readpage(fp, pp);
2501 code = afs_linux_fillpage(fp, pp);
2503 code = afs_linux_prefetch(fp, pp);
2510 /* Readpages reads a number of pages for a particular file. We use
2511 * this to optimise the reading, by limiting the number of times upon which
2512 * we have to lookup, lock and open vcaches and dcaches
2516 afs_linux_readpages(struct file *fp, struct address_space *mapping,
2517 struct list_head *page_list, unsigned int num_pages)
2519 struct inode *inode = mapping->host;
2520 struct vcache *avc = VTOAFS(inode);
2522 struct file *cacheFp = NULL;
2524 unsigned int page_idx;
2526 struct pagevec lrupv;
2527 struct afs_pagecopy_task *task;
2529 if (afs_linux_bypass_check(inode))
2530 return afs_linux_bypass_readpages(fp, mapping, page_list, num_pages);
2532 if (cacheDiskType == AFS_FCACHE_TYPE_MEM)
2535 /* No readpage (ex: tmpfs) , skip */
2536 if (cachefs_noreadpage)
2540 if ((code = afs_linux_VerifyVCache(avc, NULL))) {
2545 ObtainWriteLock(&avc->lock, 912);
2548 task = afs_pagecopy_init_task();
2551 pagevec_init(&lrupv, 0);
2552 for (page_idx = 0; page_idx < num_pages; page_idx++) {
2553 struct page *page = list_entry(page_list->prev, struct page, lru);
2554 list_del(&page->lru);
2555 offset = page_offset(page);
2557 if (tdc && tdc->f.chunk != AFS_CHUNK(offset)) {
2559 ReleaseReadLock(&tdc->lock);
2564 filp_close(cacheFp, NULL);
2569 if ((tdc = afs_FindDCache(avc, offset))) {
2570 ObtainReadLock(&tdc->lock);
2571 if (!hsame(avc->f.m.DataVersion, tdc->f.versionNo) ||
2572 (tdc->dflags & DFFetching)) {
2573 ReleaseReadLock(&tdc->lock);
2580 cacheFp = afs_linux_raw_open(&tdc->f.inode);
2581 if (!cacheFp->f_dentry->d_inode->i_mapping->a_ops->readpage) {
2582 cachefs_noreadpage = 1;
2588 if (tdc && !add_to_page_cache(page, mapping, page->index,
2590 page_cache_get(page);
2591 if (!pagevec_add(&lrupv, page))
2592 __pagevec_lru_add_file(&lrupv);
2594 afs_linux_read_cache(cacheFp, page, tdc->f.chunk, &lrupv, task);
2596 page_cache_release(page);
2598 if (pagevec_count(&lrupv))
2599 __pagevec_lru_add_file(&lrupv);
2603 filp_close(cacheFp, NULL);
2605 afs_pagecopy_put_task(task);
2609 ReleaseReadLock(&tdc->lock);
2613 ReleaseWriteLock(&avc->lock);
2618 /* Prepare an AFS vcache for writeback. Should be called with the vcache
2621 afs_linux_prepare_writeback(struct vcache *avc) {
2623 struct pagewriter *pw;
2625 pid = MyPidxx2Pid(MyPidxx);
2626 /* Prevent recursion into the writeback code */
2627 spin_lock(&avc->pagewriter_lock);
2628 list_for_each_entry(pw, &avc->pagewriters, link) {
2629 if (pw->writer == pid) {
2630 spin_unlock(&avc->pagewriter_lock);
2631 return AOP_WRITEPAGE_ACTIVATE;
2634 spin_unlock(&avc->pagewriter_lock);
2636 /* Add ourselves to writer list */
2637 pw = osi_Alloc(sizeof(struct pagewriter));
2639 spin_lock(&avc->pagewriter_lock);
2640 list_add_tail(&pw->link, &avc->pagewriters);
2641 spin_unlock(&avc->pagewriter_lock);
2647 afs_linux_dopartialwrite(struct vcache *avc, cred_t *credp) {
2648 struct vrequest *treq = NULL;
2651 if (!afs_CreateReq(&treq, credp)) {
2652 code = afs_DoPartialWrite(avc, treq);
2653 afs_DestroyReq(treq);
2656 return afs_convert_code(code);
2660 afs_linux_complete_writeback(struct vcache *avc) {
2661 struct pagewriter *pw, *store;
2663 struct list_head tofree;
2665 INIT_LIST_HEAD(&tofree);
2666 pid = MyPidxx2Pid(MyPidxx);
2667 /* Remove ourselves from writer list */
2668 spin_lock(&avc->pagewriter_lock);
2669 list_for_each_entry_safe(pw, store, &avc->pagewriters, link) {
2670 if (pw->writer == pid) {
2671 list_del(&pw->link);
2672 /* osi_Free may sleep so we need to defer it */
2673 list_add_tail(&pw->link, &tofree);
2676 spin_unlock(&avc->pagewriter_lock);
2677 list_for_each_entry_safe(pw, store, &tofree, link) {
2678 list_del(&pw->link);
2679 osi_Free(pw, sizeof(struct pagewriter));
2683 /* Writeback a given page syncronously. Called with no AFS locks held */
2685 afs_linux_page_writeback(struct inode *ip, struct page *pp,
2686 unsigned long offset, unsigned int count,
2689 struct vcache *vcp = VTOAFS(ip);
2697 memset(&tuio, 0, sizeof(tuio));
2698 memset(&iovec, 0, sizeof(iovec));
2700 buffer = kmap(pp) + offset;
2701 base = page_offset(pp) + offset;
2704 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
2705 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, page_count(pp),
2706 ICL_TYPE_INT32, 99999);
2708 setup_uio(&tuio, &iovec, buffer, base, count, UIO_WRITE, AFS_UIOSYS);
2710 code = afs_write(vcp, &tuio, f_flags, credp, 0);
2712 i_size_write(ip, vcp->f.m.Length);
2713 ip->i_blocks = ((vcp->f.m.Length + 1023) >> 10) << 1;
2715 code = code ? afs_convert_code(code) : count - tuio.uio_resid;
2717 afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
2718 ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, page_count(pp),
2719 ICL_TYPE_INT32, code);
2728 afs_linux_writepage_sync(struct inode *ip, struct page *pp,
2729 unsigned long offset, unsigned int count)
2733 struct vcache *vcp = VTOAFS(ip);
2736 /* Catch recursive writeback. This occurs if the kernel decides
2737 * writeback is required whilst we are writing to the cache, or
2738 * flushing to the server. When we're running syncronously (as
2739 * opposed to from writepage) we can't actually do anything about
2740 * this case - as we can't return AOP_WRITEPAGE_ACTIVATE to write()
2743 ObtainWriteLock(&vcp->lock, 532);
2744 afs_linux_prepare_writeback(vcp);
2745 ReleaseWriteLock(&vcp->lock);
2749 code = afs_linux_page_writeback(ip, pp, offset, count, credp);
2752 ObtainWriteLock(&vcp->lock, 533);
2754 code1 = afs_linux_dopartialwrite(vcp, credp);
2755 afs_linux_complete_writeback(vcp);
2756 ReleaseWriteLock(&vcp->lock);
2767 #ifdef AOP_WRITEPAGE_TAKES_WRITEBACK_CONTROL
2768 afs_linux_writepage(struct page *pp, struct writeback_control *wbc)
2770 afs_linux_writepage(struct page *pp)
2773 struct address_space *mapping = pp->mapping;
2774 struct inode *inode;
2777 unsigned int to = PAGE_CACHE_SIZE;
2784 inode = mapping->host;
2785 vcp = VTOAFS(inode);
2786 isize = i_size_read(inode);
2788 /* Don't defeat an earlier truncate */
2789 if (page_offset(pp) > isize) {
2790 set_page_writeback(pp);
2796 ObtainWriteLock(&vcp->lock, 537);
2797 code = afs_linux_prepare_writeback(vcp);
2798 if (code == AOP_WRITEPAGE_ACTIVATE) {
2799 /* WRITEPAGE_ACTIVATE is the only return value that permits us
2800 * to return with the page still locked */
2801 ReleaseWriteLock(&vcp->lock);
2806 /* Grab the creds structure currently held in the vnode, and
2807 * get a reference to it, in case it goes away ... */
2813 ReleaseWriteLock(&vcp->lock);
2816 set_page_writeback(pp);
2818 SetPageUptodate(pp);
2820 /* We can unlock the page here, because it's protected by the
2821 * page_writeback flag. This should make us less vulnerable to
2822 * deadlocking in afs_write and afs_DoPartialWrite
2826 /* If this is the final page, then just write the number of bytes that
2827 * are actually in it */
2828 if ((isize - page_offset(pp)) < to )
2829 to = isize - page_offset(pp);
2831 code = afs_linux_page_writeback(inode, pp, 0, to, credp);
2834 ObtainWriteLock(&vcp->lock, 538);
2836 /* As much as we might like to ignore a file server error here,
2837 * and just try again when we close(), unfortunately StoreAllSegments
2838 * will invalidate our chunks if the server returns a permanent error,
2839 * so we need to at least try and get that error back to the user
2842 code1 = afs_linux_dopartialwrite(vcp, credp);
2844 afs_linux_complete_writeback(vcp);
2845 ReleaseWriteLock(&vcp->lock);
2850 end_page_writeback(pp);
2851 page_cache_release(pp);
2862 /* afs_linux_permission
2863 * Check access rights - returns error if can't check or permission denied.
2866 #if defined(IOP_PERMISSION_TAKES_FLAGS)
2867 afs_linux_permission(struct inode *ip, int mode, unsigned int flags)
2868 #elif defined(IOP_PERMISSION_TAKES_NAMEIDATA)
2869 afs_linux_permission(struct inode *ip, int mode, struct nameidata *nd)
2871 afs_linux_permission(struct inode *ip, int mode)
2878 /* Check for RCU path walking */
2879 #if defined(IOP_PERMISSION_TAKES_FLAGS)
2880 if (flags & IPERM_FLAG_RCU)
2882 #elif defined(MAY_NOT_BLOCK)
2883 if (mode & MAY_NOT_BLOCK)
2889 if (mode & MAY_EXEC)
2891 if (mode & MAY_READ)
2893 if (mode & MAY_WRITE)
2895 code = afs_access(VTOAFS(ip), tmp, credp);
2899 return afs_convert_code(code);
2903 afs_linux_commit_write(struct file *file, struct page *page, unsigned offset,
2907 struct inode *inode = FILE_INODE(file);
2908 loff_t pagebase = page_offset(page);
2910 if (i_size_read(inode) < (pagebase + offset))
2911 i_size_write(inode, pagebase + offset);
2913 if (PageChecked(page)) {
2914 SetPageUptodate(page);
2915 ClearPageChecked(page);
2918 code = afs_linux_writepage_sync(inode, page, offset, to - offset);
2924 afs_linux_prepare_write(struct file *file, struct page *page, unsigned from,
2928 /* http://kerneltrap.org/node/4941 details the expected behaviour of
2929 * prepare_write. Essentially, if the page exists within the file,
2930 * and is not being fully written, then we should populate it.
2933 if (!PageUptodate(page)) {
2934 loff_t pagebase = page_offset(page);
2935 loff_t isize = i_size_read(page->mapping->host);
2937 /* Is the location we are writing to beyond the end of the file? */
2938 if (pagebase >= isize ||
2939 ((from == 0) && (pagebase + to) >= isize)) {
2940 zero_user_segments(page, 0, from, to, PAGE_CACHE_SIZE);
2941 SetPageChecked(page);
2942 /* Are we we writing a full page */
2943 } else if (from == 0 && to == PAGE_CACHE_SIZE) {
2944 SetPageChecked(page);
2945 /* Is the page readable, if it's wronly, we don't care, because we're
2946 * not actually going to read from it ... */
2947 } else if ((file->f_flags && O_ACCMODE) != O_WRONLY) {
2948 /* We don't care if fillpage fails, because if it does the page
2949 * won't be marked as up to date
2951 afs_linux_fillpage(file, page);
2957 #if defined(STRUCT_ADDRESS_SPACE_OPERATIONS_HAS_WRITE_BEGIN)
2959 afs_linux_write_end(struct file *file, struct address_space *mapping,
2960 loff_t pos, unsigned len, unsigned copied,
2961 struct page *page, void *fsdata)
2964 unsigned int from = pos & (PAGE_CACHE_SIZE - 1);
2966 code = afs_linux_commit_write(file, page, from, from + len);
2969 page_cache_release(page);
2974 afs_linux_write_begin(struct file *file, struct address_space *mapping,
2975 loff_t pos, unsigned len, unsigned flags,
2976 struct page **pagep, void **fsdata)
2979 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
2980 unsigned int from = pos & (PAGE_CACHE_SIZE - 1);
2983 page = grab_cache_page_write_begin(mapping, index, flags);
2986 code = afs_linux_prepare_write(file, page, from, from + len);
2989 page_cache_release(page);
2996 #ifndef STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT
2998 afs_linux_dir_follow_link(struct dentry *dentry, struct nameidata *nd)
3000 struct dentry **dpp;
3001 struct dentry *target;
3003 if (current->total_link_count > 0) {
3004 /* avoid symlink resolution limits when resolving; we cannot contribute to
3005 * an infinite symlink loop */
3006 /* only do this for follow_link when total_link_count is positive to be
3007 * on the safe side; there is at least one code path in the Linux
3008 * kernel where it seems like it may be possible to get here without
3009 * total_link_count getting incremented. it is not clear on how that
3010 * path is actually reached, but guard against it just to be safe */
3011 current->total_link_count--;
3014 target = canonical_dentry(dentry->d_inode);
3016 # ifdef STRUCT_NAMEIDATA_HAS_PATH
3017 dpp = &nd->path.dentry;
3027 *dpp = dget(dentry);
3030 nd->last_type = LAST_BIND;
3034 #endif /* !STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT */
3037 static struct inode_operations afs_file_iops = {
3038 .permission = afs_linux_permission,
3039 .getattr = afs_linux_getattr,
3040 .setattr = afs_notify_change,
3043 static struct address_space_operations afs_file_aops = {
3044 .readpage = afs_linux_readpage,
3045 .readpages = afs_linux_readpages,
3046 .writepage = afs_linux_writepage,
3047 #if defined (STRUCT_ADDRESS_SPACE_OPERATIONS_HAS_WRITE_BEGIN)
3048 .write_begin = afs_linux_write_begin,
3049 .write_end = afs_linux_write_end,
3051 .commit_write = afs_linux_commit_write,
3052 .prepare_write = afs_linux_prepare_write,
3057 /* Separate ops vector for directories. Linux 2.2 tests type of inode
3058 * by what sort of operation is allowed.....
3061 static struct inode_operations afs_dir_iops = {
3062 .setattr = afs_notify_change,
3063 .create = afs_linux_create,
3064 .lookup = afs_linux_lookup,
3065 .link = afs_linux_link,
3066 .unlink = afs_linux_unlink,
3067 .symlink = afs_linux_symlink,
3068 .mkdir = afs_linux_mkdir,
3069 .rmdir = afs_linux_rmdir,
3070 .rename = afs_linux_rename,
3071 .getattr = afs_linux_getattr,
3072 .permission = afs_linux_permission,
3073 #ifndef STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT
3074 .follow_link = afs_linux_dir_follow_link,
3078 /* We really need a separate symlink set of ops, since do_follow_link()
3079 * determines if it _is_ a link by checking if the follow_link op is set.
3081 #if defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE)
3083 afs_symlink_filler(struct file *file, struct page *page)
3085 struct inode *ip = (struct inode *)page->mapping->host;
3086 char *p = (char *)kmap(page);
3090 code = afs_linux_ireadlink(ip, p, PAGE_SIZE, AFS_UIOSYS);
3095 p[code] = '\0'; /* null terminate? */
3097 SetPageUptodate(page);
3109 static struct address_space_operations afs_symlink_aops = {
3110 .readpage = afs_symlink_filler
3112 #endif /* USABLE_KERNEL_PAGE_SYMLINK_CACHE */
3114 static struct inode_operations afs_symlink_iops = {
3115 #if defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE)
3116 .readlink = page_readlink,
3117 # if defined(HAVE_LINUX_PAGE_FOLLOW_LINK)
3118 .follow_link = page_follow_link,
3120 .follow_link = page_follow_link_light,
3121 .put_link = page_put_link,
3123 #else /* !defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE) */
3124 .readlink = afs_linux_readlink,
3125 .follow_link = afs_linux_follow_link,
3126 .put_link = afs_linux_put_link,
3127 #endif /* USABLE_KERNEL_PAGE_SYMLINK_CACHE */
3128 .setattr = afs_notify_change,
3132 afs_fill_inode(struct inode *ip, struct vattr *vattr)
3135 vattr2inode(ip, vattr);
3137 #ifdef STRUCT_ADDRESS_SPACE_HAS_BACKING_DEV_INFO
3138 ip->i_mapping->backing_dev_info = afs_backing_dev_info;
3140 /* Reset ops if symlink or directory. */
3141 if (S_ISREG(ip->i_mode)) {
3142 ip->i_op = &afs_file_iops;
3143 ip->i_fop = &afs_file_fops;
3144 ip->i_data.a_ops = &afs_file_aops;
3146 } else if (S_ISDIR(ip->i_mode)) {
3147 ip->i_op = &afs_dir_iops;
3148 ip->i_fop = &afs_dir_fops;
3150 } else if (S_ISLNK(ip->i_mode)) {
3151 ip->i_op = &afs_symlink_iops;
3152 #if defined(HAVE_LINUX_INODE_NOHIGHMEM)
3153 inode_nohighmem(ip);
3155 #if defined(USABLE_KERNEL_PAGE_SYMLINK_CACHE)
3156 ip->i_data.a_ops = &afs_symlink_aops;
3157 ip->i_mapping = &ip->i_data;